单项选择题

—______your step ,Jim, or you might fall into the water.
—Oh,dear! Look where I am going.

A. Look out
B. Take

C. Watch

D. Notice
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单项选择题
Does ______ matter if he can't finish the job on time
A．this
B．that
C．he

D．it
单项选择题
Since our knowledge is ______ none of us can exclude the possibility of being wrong.
A．controlled
B．restrained
C．finite

D．delicate
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