Correct Answer: C

Rationale: Choice C is the correct answer as it demonstrates proper subject-verb agreement. 'Lots of people' is a plural subject, requiring the plural verb 'were.' The verb 'auditioning' is also in the correct tense to match the subject. Choices A, B, and D contain errors in subject-verb agreement. In Choice A, 'There is two constellations' should be corrected to 'There are two constellations' to match the plural subject. In Choice B, 'four of the sheep needs' should be 'four of the sheep need' to agree with the plural subject. In Choice D, 'Everyone in the group have completed' should be 'Everyone in the group has completed' to match the singular subject 'Everyone.'

Correct Answer: A

Rationale: The correct answer is A. The sentence correctly uses commas to set off the non-essential clause 'which had been parked on a steep hill.' The use of commas before and after the clause helps to distinguish it as additional information that could be omitted without changing the essential meaning of the sentence. Choices B, C, and D lack appropriate punctuation to set off the non-essential clause, making them incorrect. In these options, the absence of commas or the placement of commas incorrectly within the sentence affects the clarity and structure of the sentence, violating punctuation rules for non-essential clauses.

Correct Answer: A

Rationale: The correct answer is A: Ambiguous word choice. In this sentence, the word 'friendly' is ambiguous and does not clearly convey the intended meaning. The context of the sentence suggests that 'friendly' is used inappropriately to describe a day, making the sentence unclear. Choices B, C, and D are incorrect because the issue in the sentence does not relate to transition words, tense disagreement, or an incomplete sentence.

Correct Answer: C

Rationale: The correct answer is C. A citation is required when directly quoting another author's opinion to give credit and avoid plagiarism. Choices A, B, and D do not necessitate citations as they involve the author's own opinion, personal experience, and description of a play, respectively, without directly quoting another source.

Correct Answer: B

Rationale: 'Silently' is an adverb in this sentence as it describes how the villain laughed. Adverbs modify verbs, adjectives, or other adverbs. In this case, 'silently' is modifying the verb 'laughed,' indicating the manner in which the action was performed. Choices A, C, and D are incorrect. 'Silently' is not a preposition (A) as it doesn't show a relationship between nouns or pronouns. It is not a verb (C) because it doesn't express an action or state of being. Additionally, it is not an adjective (D) since it does not describe a noun or pronoun.