There are eight tips in Dr.Roger's lecture on sleep，and one of them is：________ to bed early unless you think it is necessary.

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• 1 Not only ________ polluted but also ________ crowded.

  A.is the city；are the streets

  B.the city is；the streets are

  C.is the city；the streets are

  D.the city is；are the streets

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• 2Interest is as vital to learning as the ability to understand, even ________ so.                   

  A.more

  B.that

  C.much

  D.most

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• 3______ it rain tomorrow, we would have to put off the visit to the Water Cube.

  A.Should

  B.Could

  C.Had

  D.Were

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• 4Nobody would stand out admitting the fact，for some reason，________ they lost the game.

  A.that

  B.which

  C.what

  D.why

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• 5_________ I will visit Brazil during the 2016 Olympic Games.

  A.If I am possible

  B.If it possible

  C.If I possible

  D.If possible

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• 6Little ________ that we were watching his every move，so he seemed to be going his own way in this business.

  A.he realized

  B.he didn't realize

  C.didn't he realize

  D.did he realize

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• 7_____ on the top of the hill is a monument, dating back to hundreds of years ago.

  A.Having stood

  B.Standing

  C.Being stood

  D.Having been stood

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• 8____ under the tree was a charming girl aged about seventeen or eighteen.

  A.Sat

  B.Sitting

  C.To sit

  D.Sit

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• 9 Not once________to Michael that he could one day become a top student in his class.

  A.occurred it

  B.it did occur

  C.it occurred

  D.did it occur

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• 10-- Helen, are you going to the airport to see Jack off the day after tomorrow? -- ________ , I would go.

  A.Were he to leave tomorrow

  B.If he was about to leave tomorrow

  C.Was he to leave tomorrow

  D.If he would leave tomorrow

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