单项选择题

After 15 years in the United States, he has finally decided to　_____　American citizenship.

A．concentrate on
B．apply for
C．look out for
D．appeal on
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单项选择题
It is well known that teaching is a job,_____ enough patience.
A．calling on
B．calling off
C．calling for
D．calling in
单项选择题
There is so much work _____ today. Would you be kind enough to lend me a hand？
A．having done
B．to be done
C．being done
D．will be done
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