单项选择题

Try ______ the green button to see if the machine will start.

A．press
B．to press
C．pressing
D．to have pressed
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单项选择题
I am glad you show my letters ______ in the family, for I like them all to know what I am doing, and I can't write to every one.
A．off
B．round
C．up
D．out
单项选择题
At the turn of the Millennium, some people believed the Day of Judgment was close ______.
A．on hand
B．at hand
C．in hand
D．by hand
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