English

The word 'effluvium' refers to an unpleasant or harmful odor or discharge. Its antonym is 'fragrance,' which means a pleasant smell, making option C the correct choice.

The idiom "off and on" means "sometimes" or "occasionally," but among the options, "sometimes" (D) is the most accurate and commonly used equivalent. "Occasionally" (C) is close but less commonly used in this context. Therefore, "sometimes" is the best choice.

The sentence compares two cooks, so the correct word to refer to the previous one is 'former'. 'Former' means the first of two mentioned, while 'latter' means the second. 'Current' and 'instant' do not fit the context.

The word "fecund" means fertile or capable of producing abundant offspring or vegetation, which aligns with the synonym "fruitful." The other options do not share this meaning.

The correct preposition to use with 'persisted' in this context is 'in'. The phrase 'persist in' means to continue firmly or obstinately in an opinion or course of action, which fits the sentence meaning.

The phrase requires an indefinite article before 'known as Prince' to indicate an unspecified person. 'A man known as Prince' is grammatically correct, whereas 'The man' implies a specific person already known, which does not fit the sentence context.

The word "tremulous" means shaking or quivering slightly, which is synonymous with "trembling." The other options do not share this meaning.

The word "Crucifixion" refers to a method of execution, so the closest synonym among the options is "execution." The other options do not relate to the meaning of crucifixion.

The word "labor" means work or effort, and its antonym is "rest," which means to cease work or relax. Among the options, "rest" is the correct opposite of "labor."

The correct answer is 'While' because it appropriately connects two simultaneous actions: studying English and watching a drama. 'While' indicates that both actions happened at the same time, which fits the sentence context.