Correct Answer: B

Rationale: The correct answer is 'B: 'that won the award.' A relative clause provides additional information about a noun in the sentence. In this case, 'that won the award' is the relative clause specifying which book out of all books is being referred to. It is essential to recognize and understand relative clauses for better comprehension of sentence structures. Choice A ('The book') is the main noun phrase and not a relative clause. Choice C ('was a bestseller') is the main clause of the sentence, not a relative clause. Choice D ('award') is a noun but not a relative clause as it does not provide additional information about a noun in the sentence.

Correct Answer: C

Rationale: Option C correctly uses the phrase 'by the way' to introduce additional information that is not directly related to the previous sentence, making it a natural and appropriate use of the phrase in casual conversation. Choices A, B, and D do not use 'by the way' in the same context as option C. Choice A incorrectly uses 'by the way' to convey winning the lottery, which is not a casual or incidental piece of information. Choice B incorrectly uses 'by the way' after a semicolon in a way that disrupts the flow of the sentence. Choice D correctly uses 'by the way' but the information provided about the movie starting time is not a casual or incidental addition, unlike in option C.

Correct Answer: B

Rationale: The correct answer is 'B' - 'the guests chatted and enjoyed the music.' An independent clause expresses a complete thought and can stand alone as a sentence. It typically includes a subject and a verb and does not rely on another clause to form a complete sentence. In this sentence, 'the guests chatted and enjoyed the music' fits this criteria, making it the independent clause. Choices A and C are incorrect as they are dependent clauses, starting with a subordinating conjunction 'While,' which shows they cannot stand alone as complete sentences. Choice D is also incorrect as it lacks the word 'the' before 'enjoyed,' making it grammatically incomplete.

Correct Answer: A

Rationale: Option A, 'I have been working on this project since morning,' uses the present perfect continuous tense correctly. This structure implies an action that started in the past (working on the project) and is still ongoing up to the present moment. Choice B is incorrect as it uses the present perfect tense ('has finished'), which indicates a completed action with relevance to the present. Choice C uses the future continuous tense ('will be leaving'), and Choice D uses the past perfect continuous tense ('had been living'). Therefore, only Choice A fits the criteria for the present perfect continuous tense.

Correct Answer: B

Rationale: The clause 'as the sun dipped below the horizon' functions as a subordinate clause because it provides additional information about the main clause 'We sat on the beach,' indicating a dependent relationship between the two clauses. An independent clause can stand alone as a complete sentence, which is not the case here. Appositive clauses rename or explain nouns, while noun clauses act as nouns within a sentence. In this context, 'as the sun dipped below the horizon' acts as a dependent clause, making it a subordinate clause.