Correct Answer: B

Rationale: Option B is the correct answer as it uses formal language, appropriate structure, and organized transitions like 'Ideally,' 'Secondly,' and 'Then,' which are essential for a formal speech. The tone is professional and clear, with well-constructed sentences that effectively convey the necessary information. Options A, C, and D either use informal language, lack the organized flow needed in a formal setting, or have less professional tone. Therefore, Option B stands out as the best fit for a formal speech.

Correct Answer: C

Rationale: Option C, 'enabled him to quickly rise,' is the correct choice. The sentence is referring to a past action, so the verb should be in the past tense. 'Enabled' is the correct past tense form of 'enable' in this context. Choice A ('NO CHANGE') is incorrect because it does not match the past tense required by the sentence. Option B ('are enabling him to quickly rise') is incorrect as it uses the present continuous tense, which is not suitable for the past action described. Choice D ('will enable him to quickly rise') is incorrect as it implies a future action, which is not consistent with the context of the sentence.

Correct Answer: D

Rationale: The correct answer is 'D: Rare.' In the sentence, it is mentioned that 'a hundred years ago, automobiles were rare,' which provides the context that the opposite of rare would mean something very common, thus helping to decipher the meaning of 'ubiquitous.' Choice A, 'Ago,' refers to a time frame and doesn't directly provide a contrast to 'ubiquitous.' Choice B, 'Cars,' is mentioned in both parts of the sentence and does not help in defining 'ubiquitous.' Choice C, 'Now,' signifies the current time but doesn't contrast with 'ubiquitous' to aid in its understanding.

Correct Answer: B

Rationale: Daydreaming is a passive process and may not always lead to concrete ideas. Effective brainstorming involves actively generating ideas through structured methods. Making a list of topics/subtopics helps organize thoughts, freewriting encourages continuous idea flow, and asking specific questions prompts deeper thinking and idea generation. Daydreaming, on the other hand, lacks structure and may not consistently yield productive results in a brainstorming session.

Correct Answer: D

Rationale: The correct answer is 'Anaesthetic'. 'Anaesthetic' refers to a drug that removes feeling or sensation. The prefix 'ana-' means without, and the root 'esthetic' relates to sensation or feeling. 'Hyperalgesia' refers to increased sensitivity to pain, 'Subcranial' does not relate to drugs or removing sensation, and 'Hypoglycemic' refers to low blood sugar levels, not a drug that removes feeling or sensation.