单项选择题

A teacher cannot take it for granted that his students always do their homework ______.

A．as follows
B．as required
C．as they have
D．as they do
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单项选择题
The police warned the residents in the area to keep their doors and windows ______ at night.
A．closed
B．closing
C．to close
D．to be closed
单项选择题
I have enjoyed my visit here. I'll be very sorry ______.
A．for leaving
B．to leave
C．of leaving
D．with leaving
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