单项选择题

Don't throw the papers into the rubbish. They ______ be valuable for others.

A．may
B．can
C．must
D．might
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单项选择题
I'm going to Mr. White's. Do you have anything ______
A．to send
B．sending
C．to be sent
D．being sent
单项选择题
______ give your homework to Amy She is going to teachers' office.
A．Why
B．Why not
C．Why don't
D．Why didn't
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