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
By the time that the guards in the building realized what was happening, the fire（）

A. had already been put out
B. was put out
C. would have been put out
D. had put out
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