Correct Answer: B

Rationale: The correct answer is B because 'aural' and 'oral' are homophones, but they have different meanings. 'Aural' refers to hearing, while 'oral' refers to the mouth or spoken words. In the context of treating mouth ulcers, the correct term should be 'oral paste.' Choices A, C, and D do not contain homophone errors. In choice A, 'heard' is correctly used in the context of listening. Choice C is grammatically correct and does not involve homophones. Choice D correctly uses 'effect' and does not involve homophones.

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: 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: C

Rationale: Choice C, 'Other historians claim that the symbolism in the fairy tale is more about nature and the shifting seasons,' demonstrates the correct use of an apostrophe. The apostrophe in 'season's' indicates the possessive form of 'seasons,' correctly showing ownership by the shifting seasons. Choices A, B, and D do not showcase the correct use of an apostrophe. Choice A incorrectly uses 'fairy's' instead of 'fairies,' which is the plural form of 'fairy.' Choice B uses 'historians'' which is correct for the possessive form but does not relate to the use of an apostrophe. Choice D correctly uses 'Tchaikovsky's' to indicate possession by Tchaikovsky.

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.