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

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

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

32.I don' t know ____ to stay at home or go out.  

A. whether     B. if      C. how    D. where

31.____ he will come or not is still unknown.    

A. If    B. Where     C. That     D. Whether

30. He will come ____ you ask him.          

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

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

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

28.It is late; ____, I'm too tired to go out.   

A. besides   B. except   C. except for   D. except that

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

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

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

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

25. Where have you been ____ you left home?          

A. before     B. as    C. since    D. when