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The correct answer is Option 2.

Key Points

• The primary issue in the sentence is the use of the conjunction "if" instead of "whether."
• In formal English, "whether" is preferred over "if" when a sentence presents two or more alternatives or a choice (often indicated by the presence of "or").
• The sentence presents two possibilities: he has left the building or he is still inside. Therefore, "whether" is the grammatically appropriate choice.
• Thus, the error is located in part B of the sentence.

Therefore, the correct answer is B.

Correct Sentence: "I can't confirm whether he has left the building or he is still inside."

Additional Information

• A: "I can't confirm" – This part is grammatically correct as it introduces the uncertainty.
• C: "left the building" – This part is grammatically correct, completing the first alternative.
• D: "or he is still inside." – This part provides the second alternative and is grammatically sound.
• No error – This option is incorrect because the use of "if" in a choice-based context is considered a stylistic or grammatical error in formal writing.

The correct answer is Option 5.

Key Points

• The sentence is grammatically correct as it stands.
• Part A: "When society requires" uses the correct subject-verb agreement.
• Part B: "to be rebuilt, then there is" correctly uses the passive infinitive "to be rebuilt" and the correlative structure "When... then".
• Part C: "no use attempting to" correctly uses the idiomatic expression "no use" followed by a gerund or a participle phrase.
• Part D: "rebuild it according to the old plan" is a standard prepositional phrase that completes the thought logically.
• Since no grammatical errors are present, the answer is No Error.

Therefore, the correct answer is E.

Correct Sentence: "When society requires to be rebuilt, then there is no use attempting to rebuild it according to the old plan."

Additional Information

• A: "When society requires" – "Requires" is an intransitive or transitive verb; here it functions correctly with the following infinitive.
• B: "to be rebuilt, then there is" – The use of "then" after a "when" clause is common in logical or conditional statements for emphasis, though often optional.
• C: "no use attempting to" – The phrase "there is no use [doing something]" is a standard English idiom.
• D: "rebuild it according to the old plan." – "According to" is the correct compound preposition to indicate conformity.

The correct answer is Option 1.

Key Points

• The error lies in part A of the sentence. The word "so" should be replaced with "too."
• The grammatical structure "too + adjective + to-infinitive" is used to indicate that something is more than what is desirable or possible for a certain action.
• The sentence is a common English proverb: "It is too late to shut the stable door after the horse has been stolen," which means taking precautions after the damage is already done is useless.
• Using "so" would typically require a "that" clause (e.g., "It is so late that we cannot shut the door"), which is not the structure used here.

Therefore, the correct answer is A.

Correct Sentence: "It is too late to shut the stable door after the horse has been stolen."

Additional Information

• B: "shut the stable" – This part is grammatically correct as it provides the verb and the object.
• C: "door after the horse" – This part is grammatically correct, continuing the object and introducing the time clause.
• D: "has been stolen." – This part uses the present perfect passive voice correctly to indicate an action completed in the past with relevance to the present.

The correct answer is Option C.

Key Points

• The error lies in part C of the sentence due to the redundant use of the phrase "as to."
• The phrase "as to" is often unnecessary before interrogative adverbs like why, how, where, or when, especially after verbs like tell, explain, discuss, or ask.
• The verb "tell" should be followed directly by the clause it introduces. Therefore, "tell us why" is the grammatically correct and more concise form.
• Removing "as to" ensures the sentence flows naturally without unnecessary wordiness.

Therefore, the correct answer is C.

Correct Sentence: "I think you'd better tell us why you're asking these questions."

Additional Information

• A: "I think you'd" – This is correct; "you'd" is a contraction for "you had" in the context of the idiom "had better."
• B: "better tell us" – This is correct; "had better" is followed by the bare infinitive (tell).
• D: "asking these questions." – This part is grammatically correct as it completes the present continuous structure "you are asking."

The correct answer is Option 3.

Key Points

• The error lies in part C of the sentence due to improper sentence structure and a lack of parallelism.
• The sentence uses the correlative conjunction "either... or." For the sentence to be grammatically correct and balanced, the elements following "either" and "or" should be parallel.
• In part B, "either" is followed by the verb phrase "serve us." Therefore, "or" should be followed directly by the verb phrase "cut us."
• The phrase "as we grasp" is a subordinate clause that should be placed after the verb it modifies to maintain the flow and clarity of the comparison.
• The correct sequence should be "or cut us as we grasp," making part C the erroneous section.

Therefore, the correct answer is C.

Correct Sentence: "Mishaps are like knives that either serve us or cut us as we grasp them by the handle or blade."

Additional Information

• A: "Mishaps are like knives" – This part is grammatically correct, establishing the simile.
• B: "that either serve us" – This part is correct and sets up the first half of the "either... or" construction.
• D: "them by the handle or blade." – This part is correct as it provides the object "them" (referring to knives) and the prepositional phrase.
• Parallelism: In English grammar, parallelism is the repetition of a chosen grammatical form within a sentence. By making each compared item follow the same grammatical pattern, you create a smoother writing style.

The correct answer is Option 2.

Key Points

• The sentence describes a future action, where the main clause is in the future tense ("will start weeping").
• In English grammar, time clauses (introduced by conjunctions like as soon as, when, until, before, after) do not use the future tense even if the main action is in the future.
• Instead, the simple present tense is used in these time clauses to refer to future time.
• Therefore, "as soon as she will see me" must be changed to "as soon as she sees me."

Therefore, the correct answer is Option 2.

Correct Sentence: "My mother will start weeping as soon as she sees me."

Additional Information

• Option 1: "As long as she will see me" – This incorrectly uses the future tense "will see" in a subordinate clause and changes the meaning of the conjunction.
• Option 3: "As soon as she saw me" – This uses the past tense, which is inconsistent with the future tense ("will start") used in the main clause.
• Option 4: "As far as she saw me" – "As far as" is typically used to denote distance or extent, and the past tense is grammatically incorrect in this context.
• No Improvement – This is incorrect because the original sentence contains a tense error in the time clause.

The correct answer is Option 5.

Key Points

• The sentence follows the correct grammatical rule for future time clauses.
• When a sentence refers to a future action using a time conjunction like "when," "before," "after," "until," or "as soon as," the main clause uses the future tense, while the time clause uses the simple present tense.
• In the given sentence, "We shall light the fire" is the main clause (future tense), and "when it gets cold" is the time clause (simple present tense).
• The subject "it" is singular, so the singular verb "gets" is correctly used.
• Thus, the underlined part is grammatically correct and requires no improvement.

Therefore, the correct answer is No Improvement.

Correct Sentence: "We shall light the fire when it gets cold."

Additional Information

• Option 1: "when it got cold" – This uses the past tense, which is inconsistent with the future tense "shall light."
• Option 2: "when it had got cold" – This uses the past perfect tense, which is used to describe an action completed before another past action, not a future one.
• Option 3: "while it was cold" – This suggests a continuous state in the past, which does not fit the context of a future intention.
• Option 4: "when it get cold" – This is grammatically incorrect because the singular subject "it" requires the singular verb "gets."

The correct answer is 'A-F.'

Key Points

• From the given options, only the combination of phrases 'A-F' creates a correct sentence.
• Let's look at the sentences:
• 'A-F' means She felt it was nice to meet someone who shared the same goals and values as her.

Hence, the correct answer is option 3.

The correct answer is 'elevate'.

Key Points

• The sentence explains how the introduction of cobots transforms manufacturing floors by working safely alongside humans and increasing or boosting overall production efficiency.
• The verb filling blank (A) follows "and" in parallel with "work safely alongside humans", taking "production efficiency" as its direct object. It must convey a positive improvement or rise in efficiency.
• "Elevate" means to raise to a more important or higher degree, level, or position, making it the appropriate fit.
• Other options ("hinder", "suppress", "curtail", "undermine") carry negative connotations meaning to obstruct, hold back, reduce, or weaken, which directly contradicts the advantageous impact of cobots.

Therefore, the correct answer is 'Option 5'.

Complete Passage: The introduction of collaborative robots, or cobots, is transforming modern assembly lines and manufacturing floors. Unlike traditional industrial machines that operate behind safety cages, cobots use advanced sensors to work safely alongside humans and (A) elevate production efficiency. This technological integration helps manufacturers (B) ________ repetitive strain injuries while maintaining high precision in assembly tasks. By taking over monotonous and hazardous duties, automated systems free human workers to focus on quality control and complex troubleshooting. However, deploying automated hardware requires significant capital investment, leading small enterprises to (C) ________ large upfront expenditures carefully. Furthermore, factories must provide technical reskilling programs to ensure workers can (D) ________ to digital diagnostic interfaces. If workforce training is overlooked, operational transitions risk becoming disorderly and (E) ________. When managed well, human-robot collaboration makes modern factories safer and far more (F) ________.

Additional Information

• Hinder (बाधा डालना/रोकना): Create difficulties for someone or something, resulting in delay or obstruction.
• Suppress (दबाना/दमन करना): Forcibly put an end to; prevent the development, action, or expression of.
• Curtail (घटाना/कम करना): Reduce in extent or quantity; impose a restriction on.
• Undermine (दुर्बल करना/कमज़ोर करना): Lessen the effectiveness, power, or ability of, especially gradually.

The correct answer is 'curb'.

Key Points

• The sentence discusses the health and ergonomic advantages of integrating collaborative robots, specifically how taking over monotonous tasks helps to reduce, limit, or control repetitive strain injuries among human workers.
• The verb filling blank (B) takes "repetitive strain injuries" as its object and must denote restraining, decreasing, or putting a check on physical harm.
• "Curb" means to restrain or keep in check; to limit or reduce, making "curb repetitive strain injuries" the appropriate choice.
• Other options ("induce", "incite", "aggravate", "multiply") mean to bring about, provoke, make worse/worsen, or increase significantly in number, which directly contradicts the safety and health benefits of cobots.

Therefore, the correct answer is 'Option 3'.

Complete Passage: The introduction of collaborative robots, or cobots, is transforming modern assembly lines and manufacturing floors. Unlike traditional industrial machines that operate behind safety cages, cobots use advanced sensors to work safely alongside humans and (A) elevate production efficiency. This technological integration helps manufacturers (B) curb repetitive strain injuries while maintaining high precision in assembly tasks. By taking over monotonous and hazardous duties, automated systems free human workers to focus on quality control and complex troubleshooting. However, deploying automated hardware requires significant capital investment, leading small enterprises to (C) ________ large upfront expenditures carefully. Furthermore, factories must provide technical reskilling programs to ensure workers can (D) ________ to digital diagnostic interfaces. If workforce training is overlooked, operational transitions risk becoming disorderly and (E) ________. When managed well, human-robot collaboration makes modern factories safer and far more (F) ________.

Additional Information

• Induce (प्रेरित करना/उत्पन्न करना): Succeed in persuading or leading someone to do something; bring about or give rise to.
• Incite (उकसाना/भड़काना): Encourage or stir up (violent or unlawful behavior).
• Aggravate (और बिगाड़ना/भड़काना): Make (a problem, injury, or offense) worse or more serious.
• Multiply (बढ़ाना/गुणा करना): Increase or cause to increase greatly in number or quantity.