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
Not the students but the teacher () to visit the city.

A．are hoping
B．is hoping
C．hope
D．hoping
单项选择题
Peter is my close friend and I know him well. He sleeps with the windows () every day.

A．close
B．to close
C．closing
D．closed
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