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20.-Poor Steve! I could hardly recognize him just now! 

    -________.He has changed so much. 

  A.Never mind      B.No problem      C.Not at all        D.Me neither

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19.I just don’t understand _______ that leads to so many teenagers becoming addicted to playing computer games.

  A.why it does      B.what it does     C.what it is       D.why it is

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18.Amy joined a painting group but didn’t seem to _______, so she left. 

    A.show off       B.go up          C.fit in           D.come over 

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17.-Did you enjoy yourself last night?

    -Yes, it’s very nice of you.I appreciated ________ to the party.

     A.to be invited                     B.to have invited

     C.having been invited                D.having invited

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16.Nowadays, teachers tend to be more dependent on _______ is thought to be a great teaching aid the computer.

     A.that           B.which          C.what          D.as

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15.Whenever I met her, _________ was fairly often, she greeted me with a sweet smile.

    A.who          B.which          C.when          D.that 

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