单项选择题

--The cars give off a great deal of waste gas in the streets.
--Yes. But I'm sure something will be done to ______ air pollution.

A．reduce
B．remove
C．collect
D．warn
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单项选择题
When he was there, he ______ go to that coffee shop at the corner after work every day.
A．would
B．should
C．had better
D．might
单项选择题
Some people would rather ride bicycles as bicycle riding has ______ of the trouble of taking buses.
A．nothing
B．none
C．some
D．neither
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