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35. You must work hard,____ you will not learn English well.

A. if            B. whether        C. otherwise       D. unless

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34. The book is not easy.____ it's rather difficult.

A. On the one hand                      B. On the contrary 

C. On the other hand                        D. On the other contrary

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33. He spoke loudly ____ the audience could hear him clearly.

A. so           B. that          C. so that           D. in order to

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32.I don' t know ____ to stay at home or go out.   A. whether   B. if    C. how   D. where

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31.____ he will come or not is still unknown.    A. If   B. Where   C. That   D. Whether

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30. He will come ____ you ask him.       A. whether    B. unless   C. if   D. while

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29. Everything around us is ____ solid ..liquid ____ gas.

A. not .. .but...           B. either.. .or...       C. neither.. .nor...     D. whether.. .or...

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28.It is late; ____, I'm too tired to go out.   A. besides  B. except  C. except for  D. except that

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27. We have produced 15% more cotton this year____ we did last year.

A. as           B. than         C. like          D. white

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26.____ the problem of method is solved, talking about the task is useless.

A. Until             B. Since            C. After             D. Unless

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