单项选择题

A driver should concentrate ______ the road when he is driving, or it's easy to bring accidents.

A．to
B．on
C．for
D．in
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单项选择题
As she is going to attend the entrance exam to college tomorrow, keep the bad news ______ from her.
A．back
B．away
C．down
D．off
单项选择题
You've been overworking recently, and you would find a holiday ______.
A．healthy
B．appropriate
C．valuable
D．beneficial
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