Correct Answer: B

Rationale: The clause 'While the rain poured' is a subordinate clause because it cannot stand alone as a complete sentence and provides additional information about the main action 'they huddled inside'. Subordinate clauses typically begin with subordinating conjunctions like 'while', 'because', 'if', etc. They rely on the main clause for context and meaning. In this sentence, the main action is 'they huddled inside,' making 'While the rain poured' a subordinate clause. The other choices are incorrect: An appositive clause renames or explains a noun, a noun clause functions as a noun within a sentence, and a main clause can stand alone as a complete sentence.

Correct Answer: B

Rationale: The correct preposition to use in this sentence is 'from' as it indicates the source of the borrowed money. 'Of' (Choice A) is incorrect as it does not convey the idea of obtaining something from a specific person. 'On' (Choice C) is also incorrect as it does not relate to borrowing money from someone. 'For' (Choice D) is incorrect as it implies a different purpose than borrowing money from her friend. Therefore, the most appropriate preposition in this context is 'from', making the sentence grammatically correct and conveying the intended meaning.

Correct Answer: D

Rationale: The correct answer is 'D, Past perfect tense.' In the sentence provided, the verb 'had left' is in the past perfect tense. The past perfect tense is used to indicate an action that was completed before another past action, which in this case is 'arrived.' Therefore, the main verb tense in the sentence is past perfect. Choices A, B, and C are incorrect because the sentence does not contain present, past, or future tense verbs as the main verb. Instead, the main verb 'left' is in the past perfect tense, showing an action completed before another past event.

Correct Answer: A

Rationale: The word 'flagrant' in option A is the most appropriate choice for the blank because it conveys the idea of errors that are glaringly obvious and inexcusable. In this context, the research paper is described as being 'riddled with errors,' suggesting a significant amount of mistakes that stand out and are severe. Choice B, 'cursory,' meaning superficial, does not accurately describe the seriousness of the errors. Choice C, 'innocuous,' meaning harmless, is the opposite of what is implied by the sentence. Choice D, 'meticulous,' meaning carefully detailed, is the opposite of what is needed to describe errors in this context.

Correct Answer: B

Rationale: An interrogative sentence is a type of sentence that asks a question. In this case, choice B 'What is your favorite color?' is an interrogative sentence because it is asking a question and ends with a question mark. Choices A, C, and D are not interrogative sentences as they do not pose a question to elicit a response. Choice A is a declarative sentence, choice C is an imperative sentence, and choice D is also a declarative sentence.