Correct Answer: B

Rationale: Option B correctly uses a semicolon to join two independent clauses related to the same event. In this sentence, 'The guests arrived' and 'Sarah greeted them at the door' are both independent clauses that are appropriately connected using a semicolon. Choice A incorrectly uses a semicolon before 'however,' which is a conjunction that should be preceded by a comma. Choice C incorrectly uses a semicolon to connect two independent clauses that are not closely related. Choice D incorrectly uses a semicolon to connect two independent clauses without a clear relationship or cohesion.

Correct Answer: C

Rationale: The correct answer is C. The idiom 'to cross that bridge when we come to it' means to deal with challenges as they arise, not worrying about them prematurely. It suggests addressing problems when they actually occur rather than stressing over potential issues in advance. Choice A, 'To deal with a problem immediately,' is incorrect because the idiom is about not addressing problems prematurely. Choice B, 'To plan for the future in detail,' is incorrect as it goes against the essence of the idiom, which is about dealing with issues when they happen, not planning extensively in advance. Choice D, 'To avoid difficult situations,' is incorrect as the idiom implies facing challenges when they present themselves rather than avoiding them.

Correct Answer: A

Rationale: The correct answer is 'A: will have been working on.' In this sentence, the future perfect continuous tense is needed to convey that the action of working on the project will continue up to a specific future point (next month). Choices B, C, and D are incorrect. Choice B ('will work on') indicates a future action without emphasizing the duration of the action. Choice C ('has been working on') is in the present perfect continuous tense, which does not convey the future duration of the action. Choice D ('had worked on') is in the past perfect tense, which is not suitable for indicating an action continuing up to a future point.

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.

Correct Answer: B

Rationale: A semicolon is used to separate items in a list when the items themselves contain commas. In the sentence provided, 'playing video games' and 'spending time with friends' are the items that contain commas. Therefore, the correct placement of the semicolon is before the conjunction 'and,' as shown in option (B). Choice (A) incorrectly places the semicolon after 'comics,' disrupting the parallel structure. Choice (C) does not use a semicolon where needed. Choice (D) is incorrect as a semicolon is required in this context to maintain proper punctuation in the list.