单项选择题

If law and order ______, neither the citizen nor his property is safe.

A．are not preserved
B．is not preserved
C．were not preserved
D．have not preserved
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单项选择题
The boy's father bought him a large toy train ______.
A．to play with
B．to play with it
C．which to play with
D．at which to play
单项选择题
The librarian requires that all books ______ returned before the last day of classes.
A．are
B．be
C．must be
D．would be
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