It is required that he _____ payment immediately.

Correct Answer: A

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: B

Rationale: The correct answer is 'B: had known.' In this conditional sentence, the past perfect tense is required to indicate that knowing about the weather should have happened before going to the beach. 'Knew' (choice A and C) is in the simple past tense, which doesn't convey the sequence of events accurately. 'Could have known' (choice D) is incorrect as it implies a possibility of knowing in the past, but it doesn't fit the context of the sentence where the emphasis is on prior knowledge before going to the beach.

Correct Answer: B

Rationale: In this context, 'badly' is the appropriate adverb to describe the intensity of the fear caused by the heart attack. 'Severely' and 'intensely' do not convey the same meaning in this sentence. 'Profoundly' refers more to depth or seriousness of an emotion, which doesn't fit the context of fear caused by a heart attack.

Correct Answer: A

Rationale: The correct answer is 'keep.' In this context, the sentence is in the subjunctive mood, where the base form of the verb should be used after the word 'recommended.' Therefore, 'keep' is the appropriate verb choice. 'Keeps' (choice B) is incorrect as it does not align with the grammatical structure required in this sentence. Choices C and D are also incorrect as they do not match the verb form needed for the subjunctive mood.

Correct Answer: A

Rationale: The correct answer is 'under' as it is commonly used to describe the state of being affected by anesthesia. The patient is 'under' anesthesia, not 'within,' 'with,' or 'over' it. 'Within' typically refers to being inside something, 'with' indicates being accompanied by something, and 'over' suggests being above or on top of something. Therefore, in the context of the sentence, 'under' is the most appropriate choice.