单项选择题

Great efforts to increase wheat production must be made if bread shortages（）avoided.

A. will be
B. can be
C. are to be
D. were to be

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单项选择题
If he （） on tourists for his business, he would have to close his shop.

A. depends
B. will depend
C. depended
D. has depended
单项选择题
If we（）the oil company to build this paper mill, we（）water pollution now.

A. had not allowed, would not have
C. didn’t allow, would not have
B. had not allowed, would not have had
D. didn’t allow, would not have had
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