单项选择题

If you don't look ______ , you'll get that heavy box on your head.

A．out
B．on
C．into
D．over
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单项选择题
With the fall in the number of students studying science, we will have lost many with the potential for intellectual ______.
A．creativity
B．credentials
C．recreation
D．credibility
单项选择题
It is necessary that an efficient worker ______ his work on time.
A．accomplishes
B．can accomplish
C．accomplish
D．has accomplished
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