单项选择题
Since we can't hear you at the back of the hall, you'll have to（）your voice.
A.improve B.increase C.raise D.open
单项选择题 The price they offered for my old car was so low that I（）it down.
单项选择题 The noise of the traffic（）Paul from his work.
单项选择题 People appreciate（）with him because he has a good sense of humor.
