单项选择题

They looked both ways before ______ the street.

A．they crossing
B．cross
C．crossed
D．crossing
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单项选择题
______, you'll accomplish nothing.
A．Without work hard
B．With working hard
C．Without working hard
D．Not work hard
单项选择题
Everyone should ______ the danger of smoking.
A．aware that
B．be aware of
C．aware of
D．be aware that
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