单项选择题

It took me two hours to figure out how to do it.

A. guess
B. sum up
C. understand
D. summarize
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Can you lend me some dollars I just lack cash.
A. short
B. need
C. waste
D. arrange
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My teacher always inspires me to do what I prefer.
A. teaches
B. asks
C. encourages
D. insists
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