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50.-Listen! Helen is singing in the hall.

    -It      be Helen. She has gone to Beijing.

    A.can’t          B.may           C.mustn’t        D.should

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49.Attention, please. I have      to tell you.

    A.nothing serious   B.serious nothing   C.something serious D.serious something

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48.Don’t open the window      it is so cold.

    A.because        B.because of      C.since          D.as

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47.The socks are       small for the boy.

    A.too much       B.too many       C.much too       D.many too

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46.-Would your brother  go for a picnic this Sunday?

    -If I do,      .

    A.so does he      B.so will he       C.so he does      D.so he will

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45.Scientists should      new ways to solve the pollution problem.

    A.catch up with    B.come up with    C.keep up with     D.make up with

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44.The dentist      the man’s teeth and found nothing serious with him.

    A.looked after     B.looked for      C.looked over     D.looked at

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43.-Mum, I think I’m     to get back to school.

    -Not really, my dear. You’d better stay at home for another day or two.

    A.well enough     B.so well         C.good enough     D.so good

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42.I like both of the skirts. I really don’t know     .

    A.to choose what   B.to choose which  C.which to choose  D.How to choose

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