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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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14.---Can I keep the book any longer?

---Yes, but it _______ be renewed when time is due.

     A.shall         B.need         C.will             D.can

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