Correct Answer: D

Rationale: The correct answer is D. A complex sentence consists of an independent clause and at least one dependent clause. In this case, 'Tabitha tried rock climbing' is the independent clause, and 'despite having a fear of heights' is the dependent clause, making it a complex sentence. Choice A has been corrected to include a complete dependent clause, 'despite her fear of heights.' Choice B is incorrect because the semicolon does not appropriately connect the clauses. Choice C is incorrect as it combines two independent clauses without a dependent clause. Therefore, only choice D correctly forms a complex sentence with an independent and dependent clause.

Correct Answer: B

Rationale: The correct answer is 'I will be unable to come to your party.' This sentence uses formal language by avoiding contractions and employing a more polished wording. Choice A, 'I can't come to your party,' contains a contraction ('can't'), which makes it less formal. Choice C, 'I won't be able to go to your party,' though polite, still uses a contraction ('won't') and is not as formal as the correct answer. Choice D, 'I can't go to your party,' also includes a contraction and is less formal compared to the most formal choice, which is option B.

Correct Answer: C

Rationale: The correct answer is 'C: Application.' In the sentence, 'application' can refer to a formal request (such as a college application) or the act of applying something (like applying for a job). The word 'overjoyed' (A) only has one meaning, conveying extreme happiness. 'Finally' (B) indicates the completion of a task or reaching the end of something, without multiple interpretations. 'College' (D) refers specifically to an educational institution and does not have multiple meanings in this context.

Correct Answer: D

Rationale: The correct plural form of the noun 'class' is 'classes.' When forming the plural of 'class,' you add 'es' to the singular form. Choices A, B, and C do not correctly represent the plural form of 'class' and are therefore incorrect. Choice A is the singular form, choice B is incorrect as it includes an apostrophe, and choice C shows possession which is not required for pluralization.

Correct Answer: D

Rationale: The correct answer is 'D: Sleepwalker.' A somnambulist is someone who walks or performs other activities while asleep, commonly known as a sleepwalker. In the given sentence, the context of waking up outside in pajamas in the middle of the night indicates an occurrence associated with sleepwalking. Choice A, 'Explorer,' is incorrect as it does not relate to the behavior described. Choice B, 'Magician,' is not related to the context of sleepwalking. Choice C, 'Insomniac,' refers to a person who has difficulty falling asleep or staying asleep, which is not the meaning conveyed in the sentence. Therefore, 'D: Sleepwalker' is the most appropriate choice based on the context clues provided.