Correct Answer: C

Explanation: The problem with this sentence is that it uses the passive voice and a mistaken pronoun to refer to people (i.e. that). Choice "Alumni who have worked hard since graduation and now consider themselves successful usually look forward to high school reunions" and choice "Alumnus that have worked hard since graduation and now consider themselves successful usually look forward to high school reunions" change the passive voice to the active voice by writing that the alumni commit the action, rather than writing that the action was committed by the alumni. Also, choice "Alumnus that have worked hard since graduation and now consider themselves successful usually look forward to high school reunions" mistakenly changes "alumni" (plural) to "alumnus" (singular). Choice "Alumni who have worked hard since graduation and now consider themselves successful usually look forward to high school reunions" is the best choice because "alumni" is plural as it should be based on the logic of the sentence (not just one person looks forward to high school reunions) and the active voice is properly implemented.

Correct Answer: B

Explanation: "In many cultures they consider fish eggs a delicacy" is tempting, but the pronoun "they" is vague. "They consider fish eggs to be a delicacy in many cultures" has the same vague pronoun problem. "In many cultures a delicacy is considered to be fish eggs" is just weird all over. "Fish eggs, a delicacy in many cultures" is a fragment.

Correct Answer: A

Explanation: This word creates an improper double negative in the sentence.

Correct Answer: D

Explanation: The correct answer is "who" because "who" should only be used to describe people, not things. Since a clock is clearly a thing, this sentence would be correct if "who" were changed to "that." Note that "who" can sometimes be used to refer to personified things to emphasize their human qualities. For example, that cartoon features a clock named Frank who sings, dances, and talks to the people in the village. In this case, the writer uses "who" to convey the clock's similarity to a person. By comparison, the clock in Titus' clock shop is just a clock.

Correct Answer: D

Explanation: The correct answer is "starts" because the tense of the verb "starts" doesn't agree with the rest of the sentence, even though it may seem to agree with "knows" at first glance. Note, however, that "know" has to agree with "farmer" while "starts" describes the action of "heat" and must agree with that noun instead. Changing "starts" to "start" will correct the problem.