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
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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
单项选择题
With everything she needed _____,she went out of the shop,with her hands full of shopping bags.
A．bought
B．to buy
C．buying
D．buy
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