Correct Answer: A

Rationale: Option A correctly uses the past perfect tense to show an action that was completed before another past action. In this sentence, 'the party had already begun' indicates that the party started before 'I arrived.' This structure is typical of the past perfect tense. Choice B uses the past perfect tense but does not demonstrate the sequence of actions in the past. Choice C uses the future perfect tense, indicating completion of an action by a future time. Choice D uses the past perfect continuous tense, not the simple past perfect tense required by the question.

Correct Answer: C

Rationale: The main function of transition words and phrases in writing is to connect ideas smoothly and guide the reader's flow. They serve to establish logical relationships between different parts of the text, ensuring coherence and facilitating a clear progression of thoughts. Choice A is incorrect as transition words are meant to enhance clarity and coherence, not add unnecessary embellishments. Choice B is incorrect because while transition words can provide emphasis, their primary role is in facilitating the flow of ideas. Choice D is also incorrect as introducing opposing viewpoints and counterarguments is typically done through different means such as specific phrases or signal words.

Correct Answer: A

Rationale: Option A correctly uses the passive voice by placing the emphasis on the object (letter) that received the action (was written) rather than the subject performing the action. The phrase 'by Mary' indicates the agent who performed the action, making it a clear example of the passive voice structure. Choices B, C, and D are all in the active voice, where the subject performs the action directly on the object. In the context of identifying the correct usage of the passive voice, option A stands out as the only suitable example.

Correct Answer: B

Rationale: Option B is the correct answer as it uses the gerund (-ing) form for all three hobbies, achieving parallel structure. Parallel structure requires that elements in a sentence are grammatically balanced. In this case, all three activities are presented in the same form, making the sentence clear and consistent. Choices A, C, and D do not exhibit parallel structure as they mix verb forms or use infinitives, breaking the parallelism needed for correct grammar.

Correct Answer: C

Rationale: Option C uses formal language by employing more sophisticated vocabulary ('cinematic experience') and refraining from informal terms like 'awesome' and 'flick.' Choice A ('awesome') and Choice D ('flick') use informal language typically used in casual contexts, making them less formal. Choice B, while more formal than Choices A and D, is still less formal than Choice C due to its less sophisticated vocabulary and directness in expressing dissatisfaction compared to the refined language used in Choice C.