单项选择题

It is essential that these application forms ______ back as early as possible.

A．must be sent
B．will be sent
C．are sent
D．be sent
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单项选择题
In previous times, when fresh meat was in short______, pigeons were kept by many households as a source of food.
A．store
B．provision
C．reserve
D．supply
单项选择题
It is important that the hotel receptionist______ that guests are registered correctly.
A．has made sure
B．made sure
C．must make sure
D．make sure
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