Correct Answer: D

Rationale: The correct answer is sentence D: 'I cooked, so I could eat dinner.' This sentence uses a comma correctly to separate two independent clauses, 'I cooked,' and 'so I could eat dinner.' Choice A is incorrect as it lacks punctuation to separate the clauses properly. Choice B incorrectly uses a comma after 'so,' disrupting the flow of the sentence. Choice C incorrectly places a comma after 'I,' which is not needed in this context.

Correct Answer: C

Rationale: The correct answer is C because there is a tense disagreement in the sentence. The use of 'was' (past tense) and 'she's' (contraction of 'she is' present tense) creates an inconsistency in the verb tense. The sentence should maintain consistency either in past tense ('She was a gifted pianist, although she struggled with the piece for her upcoming concert') or present tense ('She is a gifted pianist, although she's struggling with the piece for her upcoming concert'). Choices A, B, and D are incorrect as the issue in the sentence is related to verb tense disagreement, not transition words, diction, or sentence completeness.

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: A

Rationale: The sentence 'Neither of the cars is parked on the street' is incorrect in terms of subject-verb agreement. The subject 'Neither' is singular, so the verb should also be singular, which should be 'is' instead of 'are.' The correct sentence should be 'Neither of the cars is parked on the street.' Choices B, C, and D demonstrate correct subject-verb agreement. In choice B, 'Both' is plural and agrees with the plural verb 'are.' In choice C, 'Any' is singular and agrees with the singular verb 'are.' In choice D, 'Each' is singular and agrees with the singular verb 'is.'

Correct Answer: D

Rationale: In the sentence, 'The realtor showed her and me a house on Wednesday afternoon,' the pronouns 'her' and 'me' are used as objects of the verb 'showed.' When choosing pronouns to fill in the blanks, it is important to use objective pronouns to maintain correct grammar and sentence structure. Choice A ('She, I') and Choice B ('She, me') are incorrect as 'I' and 'she' are subjective pronouns, not objective pronouns needed as objects in this sentence. Choice C ('Me, her') is also incorrect as the order and usage of pronouns are reversed from the correct form in the sentence.