Although new problems ______ during the last experiment, they didn't give up.   

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• 1Although he failed when he tried doing the experiment for the first time, he decided to try it____.

  A.once in a while

  B.at once

  C.once more

  D.once

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• 2---Wow, so many books here! How can you find the one you need? ---That's easy. The books are  ________  according to subject．

  A.judged

  B.associated

  C.classified

  D.obtained

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• 3Many people _____ the opening ceremony of 2010 World Expo, which was so amazing.

  A.witnessed

  B.participated

  C.swallowed

  D.handled

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• 4With two extra floors built, this hotel can ________ more people than before.

  A.appreciate

  B.abandon

  C.accommodate

  D.approach

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• 5The government has taken a series of measures to _________ people's needs in our country, which has provided good opportunities for many companies.

  A.explain

  B.expand

  C.export

  D.expect

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