单项选择题

John's score on the test is the highest in the class; he ______ last night.

A．must study
B．should have studied
C．must have studied
D．is sure to study
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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
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
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