Correct Answer: A

Rationale: In this sentence, 'Oneself' is the correct reflexive pronoun to use when referring back to the singular subject 'a person.' It is important to match the reflexive pronoun with the singular noun. 'Yourself' and 'Themselves' are plural forms and do not agree with the singular subject 'a person.' 'Itself' is used for inanimate objects, not for people. Therefore, 'Oneself' is the most suitable choice in this context.

Correct Answer: C

Rationale: The correct answer is 'C: Had known.' In this sentence, the structure is a third conditional, which is used for unreal situations in the past. 'Had known' is the correct past perfect form that matches the conditional structure. It indicates that if they had possessed the knowledge about the bad weather in advance, they wouldn't have gone to the beach. Options A, B, and D do not correctly fit the past perfect tense required in this context. 'Know' (Option A) is present tense, 'Knew' (Option B) is simple past tense, and 'Were knowing' (Option D) is incorrect and does not convey the intended meaning of the sentence in the context of a third conditional.

Correct Answer: A

Rationale: The correct answer is 'Was studying,' which is the past continuous form describing an action that was happening at a specific time in the past. Choice B, 'Didn't study,' is incorrect because it's in simple past tense, not the continuous form required by the context. Choice C, 'Studied hard,' is incorrect as it lacks the continuous aspect required by the context. Choice D, 'Would have studied,' is in the wrong tense; it is a hypothetical past action, not an action in progress in the past.

Correct Answer: A

Rationale: The correct answer is 'A: Has.' In this sentence, 'he' is singular, so the verb should also be singular. 'Has' is the correct form of the verb for the third-person singular subject 'he.' The verb 'have' is plural and does not agree with the singular subject. 'Might' and 'should' are modal verbs that do not fit the context of the sentence requiring a simple verb form.

Correct Answer: C

Rationale: In this sentence, the correct reflexive pronoun is 'myself' as it reflects the action back onto the subject. 'I want to do it myself' means the child wants to do something on their own without assistance from others. Choice A 'Mine' is a possessive pronoun and doesn't fit in the context of the sentence. Choice B 'Me' is an object pronoun and doesn't show the action reflecting back on the subject. Choice D 'Me self' is not a correct form of a reflexive pronoun in English.