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: 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 B, 'He ate a lot on vacation, but he did not gain any weight.' The conjunction 'but' is used to show a contrast between the two clauses. Choices A, C, and D do not effectively demonstrate the contrast between eating a lot and not gaining weight, making them incorrect. Choice A introduces a conditional relationship that is not present in the original sentences. Choice C implies a causal relationship that is not intended. Choice D also suggests a causal link that is not appropriate given the context.

Correct Answer: A

Rationale: The correct answer is 'A: Coordinate clause.' In the sentence 'I ate, and he drank,' 'I ate' and 'he drank' are coordinate clauses. They are both independent clauses that are joined by the coordinating conjunction 'and.' A coordinate clause is a type of independent clause that is equally important and balanced within a sentence. A dependent clause cannot stand alone as a complete sentence and relies on an independent clause. A subordinate clause is a type of dependent clause that functions within a sentence to provide additional information but does not express a complete thought. An independent clause, on the other hand, can stand alone as a complete sentence.

Correct Answer: D

Rationale: In the given sentence, the words that should be capitalized are 'She,' 'do,' and 'Indian.' 'She' needs to be capitalized as it is the pronoun referring to a person, 'do' should be capitalized as it is the beginning of a question, and 'Indian' should be capitalized as it refers to a specific nationality or culture. Choice A is incorrect as 'do' is missing. Choice B is incorrect as 'Indian' is not capitalized. Choice C is incorrect as 'Indian' is not capitalized. Therefore, the correct answer is D.