Correct Answer: B

Rationale: The correct answer is 'B: On.' The phrase 'on the world' is incorrect. The preposition 'on' is used to indicate position or location, making it the appropriate choice in this context. Therefore, the correct sentence should read: 'The blue whale is the largest animal on the world.' Choices A, C, and D are incorrect because 'in,' 'of,' and 'at' are not suitable prepositions to describe the blue whale's size in relation to the world.

Correct Answer: D

Rationale: The correct answer is 'Almost never attends.' In English, adverbs like 'almost' usually come before the main verb in a sentence. In this case, the adverb 'almost' should precede the verb 'attends.' Therefore, the correct word order is 'Almost never attends,' indicating that he rarely goes to football games. Choices A, B, and C have incorrect word order for the adverb 'almost' in relation to the verb 'attends,' making them grammatically incorrect and not conveying the intended meaning.

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: A

Rationale: The correct answer is 'Was studying,' which is the past continuous form describing an action that was happening at a specific time in the past. Choice B, 'Didn't study,' is incorrect because it's in simple past tense, not the continuous form required by the context. Choice C, 'Studied hard,' is incorrect as it lacks the continuous aspect required by the context. Choice D, 'Would have studied,' is in the wrong tense; it is a hypothetical past action, not an action in progress in the past.