It would make sense for an “unmanned” ship to spook the men on board another ship. “Unmanned” means not manned or not controlled by people. To provide further help, “unacceptable” means not acceptable. Notice how the prefix "un-" means not in this instance. To provide even more help, “implacable” means relentless, “implicit” means suggested, implied, or understood without having to be overtly stated; and “impossible” means not possible. Like "un-," "im-" is another prefix that means not.

We know that Rebecca "had no work experience" and "knew that she wouldn't earn very much if she accepted [the job]," so we need to pick out a word to describe the corresponding relationship between the job's pay and experience. "Unequal" cannot be the correct answer, because if the job's pay were unequal with experience, Rebecca might not be so sure that she wouldn't earn very much, having no experience. "Commensurate," however, is an adjective that means "corresponding in size or degree; in proportion," and because it best describes the relationship between the job described in the sentence and a worker's experience, "commensurate" is the correct answer.

We can infer that because Sandra "overheard [the girls] loudly mocking her outfit and glasses," she was likely surprised at how openly insulting they were being. So, we need to pick out an adjective for the blank that means something like "insulting." "Supportive" cannot be the correct answer, then, because "supportive" means "providing encouragement or emotional help," making it an antonym of "insulting." "Derogatory," however, is an adjective that means "showing a critical or disrespectful attitude," and because "derogatory" best describes the girls' insensitive comments at lunch, "derogatory" is the correct answer.

We can infer that because the tundra is described as "initially appear[ing] to be . . . empty," we need to pick out an adjective that means something like "empty" or could logically describe an empty environment. "Messy," then, cannot be the correct answer, because if an environment is "empty," it is highly unlikely to be "messy." "Stark," however, is an adjective that means "severe or bare in appearance or outline," or in other words, "having a very plain and often cold or empty appearance." Because "stark" is the answer choice that best describes the tundra's "empty, desolate" environment, "stark" is the correct answer.

We can infer that because the sentence is discussing allowances and "the importance of saving money," the sentence is likely talking about a kind of responsibility that has to do with using money wisely. So, we need to pick out an adjective that means something like "financial" or "having to do with money." "Fiscal," an adjective that means "of or relating to government revenue, especially taxes" or "of or relating to financial matters," best fits the sentence's context, so "fiscal" is the correct answer.

We know that the people discussed in the sentence "usually assume that the writing of [thank-you] notes is compulsory for everyone else as well." So, we can infer that the people discussed think that writing thank-you notes for gifts is compulsory, and we need to pick out an adjective that means something like "compulsory." "Unimportant," then, cannot be the correct answer, because "unimportant" means "lacking in importance or significance," and wouldn't make sense in the blank. "Obligatory," however, is an adjective that can mean "required by a legal, moral, or other rule; compulsory" or "so customary or routine as to be expected of everyone or on every occasion," and because "obligatory" best describes how the sentence's subjects feel about hand-written thank-you notes, "obligatory" is the correct answer.

We can infer that after six failed attempts at solving the math problem, Sally must have felt a bit annoyed. So, we need to pick out an answer choice that means something like "annoyed." "Successful" cannot be the correct answer because it would not make sense in the blank; one would not likely feel very successful after six failed attempts at solving a math problem. "Frustrated," however, when used as an adjective, means "feeling or expressing distress and annoyance, especially because of inability to change or achieve something." Because "frustrated" best describes how someone would probably feel after failing to solve a math problem six times, "frustrated" is the correct answer.

We can infer that because Carolyn “had to stay home from school because she had the flu,” that we need to pick out an adjective to describe her that means something like “sick.” That means that “robust” cannot be the correct answer, because “robust” is an adjective that means “strong and healthy,” making it an antonym of the word for which we’re looking. “Indisposed,” however, is an adjective that can mean “unwell,” and because “indisposed” best fits the context of the sentence, “indisposed” is the correct answer.

In terms of public speaking, Natasha was anxious about public speaking and therefore she was flustered when she began to speak; in other words, she was nervous and slightly agitated.

We know that Kim expected the bill to be smaller, so we should pick out an answer choice that means something like "shocked." Since "stupefied" means "astonished and shocked," "stupefied" is the only answer that fits the context of the sentence, so "stupefied" is the correct answer.