单项选择题

One of the main problems in the city is （） pollution.

A. how to do away with
B. how can do away with
C. that to do away with
D. that how to do away with

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单项选择题
Agriculture was a step in human progress （） which subsequently there was not anything comparable until our own machine age.

A. in
B. for
C. to
D. from
单项选择题
I would appreciate （） it a secret.

A. you to keep
B. your keeping
C. that you keep
D. that you will keep
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