单项选择题

--I always look out when crossing the street.
--You are right. You can't be too ______.

A．nervous
B．careful
C．careless
D．hurried
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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
单项选择题
Tom went out to play with his homework ______.
A．done
B．to do
C．doing
D．being done
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