We must try our best to         the river being polluted any more.

试卷相关题目

• 1This is the first time she ________ Beijing．

  A.has gone

  B.has been gone

  C.has been going

  D.is being gone

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• 2World energy demand ________ at a rate of about 3％ per year．

  A.will increase

  B.increased

  C.has increased

  D.is increasing

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• 3It is said that the book _________ many events that can't be found in other books.

  A.covers

  B.writes

  C.prints

  D.reads

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• 4This is the first time I ________ here．

  A.was

  B.am going

  C.have been

  D.came

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• 5You can go out when you ________ your homework．

  A.have finished

  B.will finish

  C.shall finish

  D.had finished

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• 6Professor Li ________ back from the United States for over two months．

  A.has come

  B.has been

  C.had come

  D.came

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• 7Over the past three decades the number of students leaving home each year to study abroad ________ at an annual rate of 3.9 percent, from 800,000 in 1975 to 3.5 million in 2008．

  A.grew

  B.grows

  C.have grown

  D.has grown

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• 8I ________ the bike for 10 years．

  A.bought

  B.have bought

  C.have had

  D.have

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• 9It took him a long time to ______ the skills he needed to become an artist.

  A.acquire

  B.arrive

  C.return

  D.cover

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• 10We don't like our maths teacher, who ________ us about our careless homework and lack of diligence．

  A.has forever criticized

  B.forever criticize

  C.is forever criticizing

  D.does forever criticize

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