With the help of high technology, many new substances（物质）______in the past years.

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• 1Many British people have noticed that butterflies _______ from its natural habitats during the past several years.

  A.are disappearing

  B.have been disappeared

  C.have been disappearing

  D.will have disappeared

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• 2It's only six o'clock now; Little Tom should be up ,though, because he _____ for nine hours.

  A.has been sleeping

  B.had been sleeping

  C.has slept

  D.had slept

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• 3I should say sorry to you but I ____trouble. 

  A.did not mean causing

  B.did not mean to cause

  C.meant causing

  D.meant to cause

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• 4Linda ，make sure the tables ______ before the guests arrive.

  A.be set

  B.set

  C.are set

  D.are setting

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• 5Hurry up; it is required that we ______ at six.

  A.will arrive

  B.arrived

  C.arrive

  D.would arrive

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• 6—Jane, have you finished your paper?   —No, I ____ my sister with her homework all the morning.

  A.help

  B.have been helping

  C.helped

  D.was helping

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• 7---Do you like the new pen? ---Yes, it_____ smoothly.  

  A.is written

  B.is writing

  C.writes

  D.wrote

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• 8--We ______ that you would fix the TV set for us. --I'm sorry, but I was too busy, so I ________.

  A.had expected; had fixed it

  B.expected; fixed it

  C.had expected; had it fixed

  D.expect; fix it

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• 9—I say, Harry. What did you say to the laid-off worker just now? —Nothing. I ____ to myself.

  A.had only talked

  B.am only talking

  C.have just talked

  D.was just talking

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• 10—Thank goodness, you are here! What ____ you? —Traffic jam.

  A.keeps

  B.is keeping

  C.had kept

  D.kept

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