单项选择题

Great efforts to increase wheat production must be made if bread shortages ________ avoided.

A．will be
B．can be
C．are to be
D．were to be
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单项选择题
In order to be a good scientist, ________.
A．mathematics is urgent
B．one should have the mathematics
C．one must understand mathematics
D．mathematics is important to be understood
单项选择题
Who won the election for mayor A man ________ to represent every minority group in the city.
A．claim
B．is claimed
C．claimed
D．claiming
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