单项选择题

Waving one's arms can be accepted as ______ for help.

A．to cry
B．crying
C．cried
D．cry
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单项选择题
— Hurry up! We're all waiting for you. — ______. I'm very sorry. I didn't realize it was ten already.
A．Don't worry
B．I will soon be ready
C．It's still early
D．We have five minutes left
单项选择题
You ______ be tired, for you've only been working for an hour.
A．must not
B．won't
C．can't
D．may not
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