select the word that makes the following sentence grammatically correct the centrifuge cannot run by it requires constant attention
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HESI A2

Grammar for HESI A2

1. Select the word that makes the following sentence grammatically correct: The centrifuge cannot run by ___________; it requires constant attention.

Correct answer: B

Rationale: The correct answer is 'itself.' The sentence is referring to the centrifuge, which is an object, not a person. Therefore, the word 'itself' is used to indicate that the centrifuge cannot run on its own; it requires constant attention. Choices A, C, and D are incorrect because they refer to a person or people, which is not suitable in the context of the sentence.

2. Select the word or phrase that makes this sentence grammatically correct: 'Theo was in great shape; he ____ all the way back to the pier.'

Correct answer: A

Rationale: In this sentence, the correct choice is 'swam,' which is the past tense of 'swim.' Therefore, 'swam' correctly completes the sentence: 'Theo was in great shape; he swam all the way back to the pier.' 'Swimmed' is not a valid past tense form of 'swim,' 'swum' is the past participle form and doesn't fit the context, and 'swim' is the base form of the verb and is not suitable in this case.

3. He ___________ football games.

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.

4. Which of the following words fits best in the following sentence? ___________ the emergency room was not busy last night, the head nurse still did not let anyone end her shift early.

Correct answer: D

Rationale: The word 'although' is the best fit in the sentence because it indicates a contrast between the fact that the emergency room was not busy last night and the head nurse's decision not to let anyone end her shift early. 'Although' sets up a contrast by acknowledging the first part of the sentence while introducing the surprising or unexpected information that follows. Choices A, B, and C do not provide the appropriate contrast needed in this context. 'Because' implies causation, 'Provided that' implies a condition for something to happen, and 'As if' implies a comparison rather than a contrast.

5. Select the word or phrase that makes this sentence grammatically correct. Before ________ this medicine, consume a modest meal.

Correct answer: B

Rationale: The correct form to use in this sentence is the present participle 'taking.' The sentence should read, 'Before taking this medicine, consume a modest meal.' It is important to use the present participle form when talking about an action that occurs before another action. Choice A 'having taken' is incorrect as it suggests a completed action before consuming a meal. Choice C 'took' is in the past tense, not suitable for indicating an action that should happen before another. Choice D 'will take' is in the future tense, which does not fit the context of the sentence.

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