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35.     more information ,write to the address below.

    A.To            B.On            C.From          D.For

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34.If you     the right map , we wouldn’t have got lost.

    A.have bought     B.bought         C.had bought      D.would buy

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33.-Which umbrella can I take?

    -You can take     of them; I will use none.

    A.both           B.any           C.either          D.each

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32.Living in the desert involves a lot of problems,    water shortage is the worst.

    A.of which       B.when          C.of whose       D.Which

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31.Only when you have obtained enough data      come to a sound conclusion.

    A.can you        B.you can        C.would you      D.you would

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