—Theairpollutioninourcityisbec

—The air pollution in our city is becoming worse and worse.

—That’s right. But the government is trying to ________ this problem.

A．

solve

B．

plan

C．

answer

D．

discover

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When will Sally and Carol arrive？

I don't know． I have ______here for half an hour．（　　）

A．comeB．leftC．waitedD．arrived

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Eric， ______playing that computer game． Why not read a book？

OK， Mom．（　　）

A．to stopB．stoppingC．stopsD．stop

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Paul and Dale have ______in common， although they are brothers．（　　）

A．somethingB．anythingC．everythingD．nothing

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Would you like to come to my party next Sunday？

I'd love to， but I ______． I have an important meeting that day．（　　）

A．can'tB．mustn'tC．needn'tD．shouldn't

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Allan has a pet dog． I often see him ______the dog in the morning．（　　）

A．walkB．walksC．walkedD．to walk

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