Correct Answer: C

Rationale: The correct answer is C. A citation is necessary when using someone else's work, such as song lyrics, to support an argument in academic writing. In options A, B, and D, there is no need for a citation. Option A involves the professor teaching her own work, so no external citation is required. Option B refers to an original work by the speaker, which does not require citation. Option D mentions a well-known and accepted fact, which generally does not need a citation in academic writing.

Correct Answer: B

Rationale: The correct answer is 'B: On.' The prefix 'epi-' means 'on' or 'upon,' as seen in the word 'epidemic.' An epidemic refers to a situation where a disease spreads rapidly and affects many people. Choice 'A: Badly' is incorrect as it does not accurately represent the meaning of the prefix 'epi-.' Choices 'C: A lot' and 'D: A little' are also incorrect as they are not related to the prefix 'epi-' in the context of the word 'epidemic.'

Correct Answer: D

Rationale: Choice D is the correct answer because it correctly punctuates the compound sentence with a semicolon separating the two independent clauses. The use of a semicolon is appropriate when two closely related independent clauses are joined without a coordinating conjunction. Choices A, B, and C have incorrect punctuation or conjunction usage. Choice A incorrectly uses a comma before 'and,' while Choice B uses 'though' which is not the best conjunction to join the two clauses. Choice C also lacks appropriate punctuation to separate the two independent clauses.

Correct Answer: A

Rationale: The prefix 'inter-' means 'among' or 'between,' which is most fitting in the context of 'intergalactic' as 'among galaxies.' 'Below,' 'around,' and 'above' do not convey the correct meaning of the prefix 'inter-' in this context.

Correct Answer: A

Rationale: The correct order for the sentence 'yesterday she went to the store' is 'She went to the store yesterday.' In English, the standard word order for a sentence is subject-verb-object-adverbial (time). Choice A is the correct answer as it follows this standard order. Choice B changes the order of the subject and object. Choice C changes the order of the adverbial and subject. Choice D changes the order of the subject and adverbial. Therefore, choices B, C, and D are incorrect.