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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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30. Lessons ______ easily are soon forgotten.

A. learn              B. learned            C. to learn           D. learning

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29. If the building project ______ by the end of this month is delayed, the construction company will be fined.

A. being completed     B. completed          C. to be completed     D. completing

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28. I usually do the washing up and leave the cooking to my wife, ______ she’s a better cook than me.

A. unless             B. as               C. even though        D. in case

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27. Many new workers ______ and in six month they will be sent to build a new railway.

   A. are being trained     B. are training         C. will train           D. will be trained

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26. -- Oh, I ______ your camera. Is it all right if I bring it to you tomorrow?

-- All right.

    A. forget             B. have forgotten      C. forgot            D. had forgotten

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25. Was it because she was ill ______ she didn’t go to attend the meeting?

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

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24. The machine has been used for several years. It needs ______.

    A. to repair           B. repaired           C. repair             D. repairing

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23. Be quiet ______ you will wake the whole house!

  A. or                B. and              C. so               D. but

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