Correct Answer: C

Rationale: In this sentence, 'Three days from now' indicates a future timeframe, so the correct verb tense to use is the future tense. The phrase 'will perform in a show' is the best choice to make the sentence grammatically correct because it aligns with the future action of the horses. Choice A ('performing in a show') uses the present participle and is incorrect in this context. Choice B ('performed in a show') uses the past tense, which is not suitable for a future event. Choice D ('have performed in a show') uses the present perfect tense, which is also not appropriate for a future action. Therefore, the correct answer is C.

Correct Answer: B

Rationale: The sentence is written in the first-person point of view, so the appropriate pronoun to use as a substitute for 'Francesca, Bill, and I' would be 'we.' This choice maintains the correct subject-verb agreement and ensures consistency in the sentence structure by keeping the pronoun in the nominative case. Choice A, 'They,' is incorrect as it changes the subject of the sentence, leading to a lack of agreement between the pronoun and the verb. Choices C and D, 'Them' and 'Us,' are both objective pronouns and do not fit the role of the subject in this sentence.

Correct Answer: A

Rationale: The phrase 'as long as' is used to indicate a condition that needs to be met for the main clause to happen. In this sentence, the radiology department sends Troy to pick up lunch only if it isn't too busy at the office, so 'as long as' is the most suitable phrase to convey this conditional relationship. Choice B, 'as if,' implies a hypothetical comparison rather than a condition. Choice C, 'after,' suggests a sequence of events rather than a condition. Choice D, 'unless,' introduces a negative condition which does not fit the context of the sentence.

Correct Answer: A

Rationale: The word 'because' indicates the reason or cause for something. In this context, it logically connects the meteorologist's forecast of rain with Sheila bringing her umbrella to work. The conjunction 'because' explains the relationship between the rain forecast and Sheila's action of bringing an umbrella, making it the most suitable word for the sentence. Choices B, C, and D do not fit the context as they do not provide a logical reason for Sheila's action.

Correct Answer: C

Rationale: In this sentence, 'Three days from now' indicates a future timeframe, so the correct verb tense to use is the future tense. The phrase 'will perform in a show' is the best choice to make the sentence grammatically correct because it aligns with the future action of the horses. Choice A ('performing in a show') uses the present participle and is incorrect in this context. Choice B ('performed in a show') uses the past tense, which is not suitable for a future event. Choice D ('have performed in a show') uses the present perfect tense, which is also not appropriate for a future action. Therefore, the correct answer is C.