Correct Answer: A

Rationale: In this context, 'Envelopes' is the correct choice as it refers to the items (envelopes) that the mailperson is responsible for delivering. The other choices are incorrect: 'Mail' (Choice B) is too general and does not specify the items to be delivered, 'Block' (Choice C) is the location and does not make sense in the context of delivering mail, and 'Every' (Choice D) is an adjective that does not complete the sentence logically.

Correct Answer: A

Rationale: The correct answer is 'Ask' because it maintains subject-verb agreement with 'two students,' requiring a plural verb 'ask' to match the plural subject. The other choices ('Is,' 'Was,' 'Could') do not agree with the plural subject and are thus incorrect. 'Is' is singular, 'Was' is the past tense form, and 'Could' indicates a possibility but does not fit the context of the sentence.

Correct Answer: B

Rationale: In this sentence, 'Economics' is a singular subject, so it should be paired with a singular verb. 'Is' is the correct verb to use with a singular subject like 'Economics.' Therefore, the correct sentence is: 'Economics is my least favorite subject at school.' Choice A 'Am' is incorrect because it is a first-person singular form of the verb 'to be' and does not agree with the subject 'Economics.' Choice C 'Are' is incorrect as it is a plural verb form and does not match the singular subject 'Economics.' Choice D 'Been' is incorrect as it is a past participle and cannot be used as the main verb in this sentence structure.

Correct Answer: A

Rationale: The correct answer is 'Massive' as it accurately describes the size of the stage in relation to the performance. The word choice 'Massive' complements the context of a theater performance, highlighting the grandeur and scale of the stage. The other choices, 'Stunningly,' 'Lonely,' and 'Misery,' do not fit logically in the sentence as they do not relate to the physical attributes of the stage.

Correct Answer: C

Rationale: 'Carried' is correct because 'should never be' requires the past participle form of the verb 'carry' to complete the sentence properly. The sentence is in the passive voice, indicating that the action is being done to the scissors, not by them. Choices A, B, and D are incorrect as they do not form the correct past participle form needed in this context.