Correct Answer: B

Rationale: The clause 'When the clock struck midnight' is a subordinate clause because it does not express a complete thought on its own and depends on the main clause 'the magic began' to form a complete sentence. Subordinate clauses typically begin with subordinating conjunctions like 'when,' 'if,' 'because,' etc., and serve to provide additional information or context to the main clause. Choice A, 'Main clause,' is incorrect because the highlighted clause is not the primary clause that provides the main idea. Choice C, 'Appositive clause,' is incorrect as an appositive clause renames or explains a noun in the sentence, which is not the case here. Choice D, 'Noun clause,' is incorrect as a noun clause functions as a noun within a sentence, and the highlighted clause does not act as a noun but rather as a dependent clause providing contextual information.

Correct Answer: D

Rationale: Ordinals (numbers with "th", "st", "nd", etc.) are generally written as words when used before nouns. Option (d) is correct.

Correct Answer: A

Rationale: Option A uses the correlative conjunction 'either/or' correctly by presenting two exclusive options. The structure 'either...or' is used to show a choice between two alternatives, and in this sentence, it clearly presents the options of coming to the party or staying home. Choice B incorrectly separates the options with a comma after 'either,' disrupting the correlative conjunction pair. Choice C uses 'whether' instead of 'either/or,' which changes the meaning and structure. Choice D uses 'either' incorrectly, as it should be followed by 'or' to form the correlative pair.

Correct Answer: D

Rationale: The correct answer is D because it uses a question mark within the quoted material as it is a direct question. In this case, the sentence is a reported question, so it does not need additional punctuation within the reported speech. Choice A is incorrect as it incorrectly adds a comma before 'if.' Choice B is incorrect because a colon is not appropriate before 'if' in this context. Choice C is incorrect as it adds an unnecessary comma after 'wanted.'

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.