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 the following sentence grammatically correct: 'Why did we ____ try so hard?'

Correct answer: D

Rationale: 'Have to' is the correct choice as it fits the sentence structure. The sentence is in the past tense ('did we') and requires the infinitive form 'have to' to express the idea of necessity or obligation in the past. 'Has to' (Choice A) is incorrect as it is present tense, 'haven't' (Choice B) is a negative form and does not make sense in this context, and 'had to' (Choice C) would imply a past obligation that has already been fulfilled, which is not the intended meaning here.

3. Select the phrase that makes the following sentence grammatically correct: I hope that my parents ___________ if I am able to graduate early.

Correct answer: C

Rationale: The correct answer is C: 'will be delighted.' In this context, the sentence is expressing a future possibility of graduating early, so the phrase 'will be delighted' in the future tense is the most appropriate choice to match the context. Choices A, B, and D are incorrect because they do not convey the future tense needed in this sentence. Choice A ('are delighted') is in the present tense, choice B ('were delighted') is in the past tense, and choice D ('will have been delighted') uses a more complex future perfect tense which is not necessary in this context.

4. Select the correct word for the blank in the following sentence. The children and ___________ performed a skit for the elderly patients.

Correct answer: C

Rationale: In this sentence, we are looking for a pronoun that refers to more than one person. The children and 'them' performed a skit for the elderly patients. 'Them' is the correct pronoun to use in this context to indicate a group of people, which is the plural form of the pronoun. Choice A, 'he,' is singular and would not match the plural subject. Choice B, 'me,' is an object pronoun and does not fit the subject position. Choice D, 'her,' is singular and does not agree with the plural subject 'children and them.' Therefore, the correct answer is 'C: them.'

5. Which word is not spelled correctly in the context of the following sentence? The ingenious foxes managed to lever open one side of the coop.

Correct answer: A

Rationale: The word 'ingenious' is not spelled correctly in the context of the sentence. The intended word should be 'ingenious,' which means clever or resourceful, while 'ingenuous' means innocent or naive. The other choices ('foxes,' 'lever,' 'coop') are spelled correctly and are relevant to the sentence.

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