Sandstorms in China appear ____ in recent years as a result of 'desertification'.

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• 1According to the companies' websites, the number of active QQ users in China has reached 1 billion, while Qihoo 360 also claims ______ at least 300 million users before June 2010.

  A.to have

  B.to have had

  C.having

  D.having had

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• 2The opening ceremony of Beijing 2008 Olympics is a great success, which is believed ______ the Chinese splendid civilization.

  A.having been displayed

  B.to have displayed

  C.to be displayed

  D.displaying

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• 3Robert is said  _______ abroad, but I don't know what country he studied in.

  A.to be studying

  B.to study

  C.to have studied

  D.to have been studying

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• 4—Is Bob still performing?   —I'm afraid not. He is said _____ the stage already as he has become an official.     

  A.to have left

  B.to leave

  C.to have been left

  D.to be left

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• 5The boy who was believed _____ in the last exam was being questioned by the teacher when I entered his office.

  A.to cheat

  B.cheating

  C.to have cheated

  D.having cheated

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• 6The student you considered ______ hardest failed to pass the important examination.      

  A.to have studied

  B.having studied

  C.to study

  D.studying

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• 7— Is Bob still performing?   — I'm afraid not.. He is said ____ the stage already as he has become an official.

  A.to have left

  B.to leave

  C.to have been left

  D.to be left

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• 8The teachers are said _____ to the new office, where they have better conditions.

  A.to move

  B.to have moved

  C.moving

  D.having moved

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• 9The boy is considered _____ his work very well.

  A.to do

  B.to have done

  C.doing

  D.having done

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• 10The German Nazis were considered  _______  the Amber Room during World War II.   

  A.to have stolen

  B.stealing

  C.having stolen

  D.to steal

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