单项选择题

It was 12 o'clock ______the plane took off.

A．when
B．that
C．since
D．till
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单项选择题
—I always look out before crossing the street. —You are right. You can't be too______.
A．nervous
B．careful
C．careless
D．hurried
单项选择题
The square in front of the supermarket is so limited that when going there, first of all, you should consider ______your car.
A．parking
B．where to park
C．to park
D．where parking
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