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
-Oh, it's you! I ______you. -I've just had my hair cut, and I'm wearing new glasses.
[A] didn't recognize
[B] hadn't recognized
[C] haven't recognized
[D] don't recognize
单项选择题
According to a recent US survey, children spent up to 25 hours a week ______TV.
[A] to watch
[B] watching
[C] watch
[D] watched
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