单项选择题

Once the problem of the engine（）, all other problems will be readily solved.

A、 solve
B 、solved
C、 is solved
D、 will be solved

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单项选择题
Beneath our feet（）that our life depends on for food, clothing and many other things.

A、 the earth lay
B、the earth lies
C、 lie the earth
D、 lies the earth
单项选择题
Living in the desert of Africa has its problems;（）obtaining fresh water is not the least.

A、 with which
B 、for which
C、 of which
D、 which
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