单项选择题

Farmers are allowed to grow small gardens of their own and they sell their vegetables ______ the black market.

A．on
B．at
C．in
D．for
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单项选择题
You'd better let me know as soon as there is a(n) ______ position in the branch office.
A．empty
B．vacuum
C．hollow
D．vacant
单项选择题
The school committee hoped that their choice of play would be ______ with the students and their parents,
A．recognized
B．popular
C．favorable
D．fascinated
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