Correct Answer: A

Rationale: In sentence A, 'fast' is used as an adverb to modify the verb 'moved,' describing how the cars moved quickly. Choices B, C, and D use 'fast' as an adjective, describing the clock, pitch, and cars respectively. Adverbs modify verbs, adjectives, or other adverbs, while adjectives modify nouns or pronouns.

Correct Answer: A

Rationale: The correct answer is A. 'Ain't' is not grammatically correct in formal writing or speech; it should be 'isn't.' 'Ain't' is considered slang and is not appropriate for formal contexts. The other choices ('During,' 'Sure,' 'Playoff') are used correctly in the sentence.

Correct Answer: D

Rationale: 'Oneself' is the correct reflexive pronoun to use when referring to an unspecified person. In this sentence, 'oneself' is used to indicate any individual without specifying gender or number. Choices A, B, and C are incorrect as they refer to specific or known individuals, which does not fit the context of the sentence.

Correct Answer: B

Rationale: The correct answer is 'B: Abrupt.' In this context, 'precipitous' is used to describe a change that occurs suddenly or abruptly. Choice A ('Difficult') is incorrect as it does not capture the sudden nature of the change. Choice C ('Gentle') is incorrect as it conveys the opposite meaning of 'precipitous.' Choice D ('Unanticipated') is incorrect as it focuses on the element of surprise rather than the suddenness of the change.

Correct Answer: A

Rationale: The term 'fracture' refers to a 'break' in the bone. A fracture is a medical condition where there is a crack or break in a bone. 'Brake' refers to a device used to stop or slow down a vehicle. 'Cut' means to make an opening or incision with a sharp tool. 'Cure' means to relieve a person of the symptoms of a disease or condition.