10.

27. Should it rain, the crops ____. 

30. There is no light in the dormitory. They must have gone to the lecture, ____?

20. Mr. Johnson suggested ____ before details are discussed.

(  )15. The customs officer believed his story finally after the letter was shown by the man. 

60. 不能准时赴约是对他人不尊重的表现。

49. When can you begin to look at the successful room in a new way?Once you ________ the three guidelines.

44. If your brain does not make enough of a certain kind of neurotransmitter, you will ____.

31. You will have to ____ some outside help or you will never get the job finished in time.

(  )14. Unfortunately, the owner of the elephant refused to pay for the loss of the man.

(  )51. The author’s mother prefers shopping with the author’s sister because the author is slow.

59. 他所考虑的不是一个特殊的读者群，而是一般的男女读者。