单项选择题
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
单项选择题 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.
单项选择题 He said that he was （）aware of the difficulty of being a father.
单项选择题 Problems may （）
