单项选择题

Very few people could understand his lecture because the subject was very （）

A. faint
B. indefinite
C. obscure
D. gloomy

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Do you think the president will be able to （） his promise not to raise taxes

A. catch
B. capture
C. find
D. keep

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Any salesperson who sells more than the weekly （）will receive a bonus.

A. ratio
B. quota
C. allocation
D. portion

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