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33.If I    you would drop in,I would have stayed home。waiting for you.

A.have known                                B.knew  

C.would know                                D.had known

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32.一When will you be back, Peter?

   -       a couple of days.  

     A.On                B.In                 C.For                 D.By

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31.All books      to the library more than three days late will be subject to a fine.

     A.return             B.returning          C.to return            D.returned

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30.When he was only thirty years old,he had already experienced    most people only experience when they are much older.

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

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29.    in the sport‘s world,a sportsman needs to train constantly to keep himself in best condition.

   A.Survive            B.Surviving          C.To survive           D.Survived

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28.Listen, Mike.She     have done it.She's been with me at the shop all day.

     A.couldn’t         B.shouldn’t            C.needn’t           D.Wouldn’t

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27. -Do you want to go to the cinema tonight?

-Sorry, I’m so tired, I       an early night.

      A.have             B.am having          C.have had            D.had

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25.Let's go a little faster,     we’ll never get there on time.

     A.yet                B.or                 C.so                  D.and26.With age,the mineral content of human bones decreases,     them more fragile.

     A.make              B.to make           C.made               D.making

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24.一How long have you been here?

   -Only about five minutes.Henry and Simon    here with me.

     A.walk              B.have walked        C.walked              D.had walked

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23.-Was    problem solved?

   -We were trying to think of     way out,but it was difficult to find one.

     A.a;a              B.a:the            C.the;a              D.the;the

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