单项选择题

It is extremely difficult or even impossible to work out the risk of occasional passive smoking.

A. calculate
B. exercise
C. eliminate
D. convert
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单项选择题
Smith and I studied under the same supervisor, worked together, and forged a lifelong friendship.
A. assessed
B. pledged
C. produced
D. dispersed
填空题
The 17-year-old student said they had to ______ (3 words) to present to the conference.
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