单项选择题

Raising children, in the author's opinion, is______.

A．a moral duty
B．a thankless job
C．a rewarding task
D．a source of inevitable pain
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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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