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
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单项选择题
When workers push together to organize themselves in trade unions, employers find it hard to lay them ______.
A. off
B. aside
C. out
D. down
单项选择题
Some scientists are dubious of the claim that organisms ______ with age as an inevitable outcome of living.
A. depress
B. default
C. deteriorate
D. degrade
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