单项选择题

The old man walked slowly, stopping frequently ______.

A．on rest
B．at rest
C．resting
D．to rest
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单项选择题
All the reference books should be made ______ to the teachers and students in our university.
A．concerned
B．available
C．related
D．flexible
单项选择题
Don't risk ______ the job which so many people want.
A．losing
B．to lose
C．lost
D．your life to lose
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