單項選擇題

Such problem （）air, water, and noise pollutions are becoming more and more serious in some big cities.

A.like
B.as
C.of
D.about

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單項選擇題

I really hope that you will （）your trip to Canada and get back as soon as possible when people have to knowledge of the law.

A.prefer
B.refer
C.enjoy
D.i nfer

單項選擇題

He said that he was （）aware of the difficulty of being a father.

A.highly
B.fully
C.soundly
D.firmly