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.

Correct Answer: D

Rationale: In the sentence, 'Could Kendra manage to carry both Kendra's books and yours?', the possessive pronoun 'hers' is the best substitution for the underlined words. The use of 'hers' correctly indicates possession by Kendra, making it the most appropriate word choice to replace 'Kendra's books'. Choice A, 'her', is incorrect as it refers to the possessive form of a singular female noun, not being possessive of 'Kendra'. Choice B, 'his', is incorrect as it is the possessive pronoun for a singular male noun, not suitable for replacing 'Kendra's books'. Choice C, 'she's', is incorrect as it is a contraction for 'she is', which does not fit the possessive context needed in the sentence.

Correct Answer: A

Rationale: In this sentence, "committee" is a singular noun, so the correct pronoun to use is "its." The possessive pronoun "its" indicates that the committee is taking ownership of the report it finished. Choice B, "their," is incorrect as it is a plural pronoun and does not agree with the singular noun "committee." Choices C and D are also incorrect as they represent contractions ("it's" for "it is" and "they're" for "they are"), which do not fit in the context of showing possession of the report by the committee.

Correct Answer: D

Rationale: The correct phrase to use in this sentence is 'will listen and learn' because it indicates actions that will take place in the future. The verb 'will' is needed to show that these actions have not occurred yet but are planned for the upcoming months. Choices A, B, and C are incorrect because they do not convey the future tense required in the sentence. Choice A lacks the future tense, choice B is in the present continuous tense, and choice C is in the past perfect tense, which are all grammatically incorrect in this context.

Correct Answer: A

Rationale: The phrase 'Having completed' is not used correctly in the sentence. The correct form should be 'Having completed' to show that the action of completing the coursework has already been done. The use of 'complete' is incorrect as it should be 'completed' to maintain the correct verb form in the past participle. Choice B, 'was required,' is used correctly as it is in the passive voice and fits the sentence structure. Choice C, 'now prepares,' is also correct as it shows the current action of Jorge preparing for exam week. Choice D, 'prepared for,' is not the phrase in question and is used correctly in the sentence to indicate the action Jorge took in the past to get ready for exam week.