单项选择题

Wood furniture does not depreciate in value ______.

A．if they are handled properly and protected properly
B．unless handling and protecting properly
C．if properly handled and protected
D．unless for all its handling and protection

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单项选择题

So much ______ his financial position that he can't sleep at night.

A．he worries about
B．he worried about
C．did he worry about
D．does he worry about

单项选择题

A teacher ______ do every exercise but a student ______.

A．may not ; must
B．needn't; must
C．can't; should
D．mustn't; should