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

( )12. When the man came back, he found the roof of his car had been damaged by an elephant.12.【解析】题意：当这个人回来时，他发现他的车顶被一头大象弄坏了。根据短文第三句 “When he came back, its roof was badly damaged.” 可知，当他回来时，车顶被严重损坏了。本题说法正确，故答案为A。

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

10.

23. All computer systems contain hardware components for input, central processing unit and output, ____ how powerful they are.

43. According to the author, why certain foods affect our moods has something to do with ____.

45. Which of the following statements is the best according to the passage?

38. The host introduces several ways of remaining in international romance. Which of the following is not included in the suggested ways?

56. 不要曲解了我的意思，我是想说我们双方都能保持冷静的态度，尽快达成一致来解决问题。

35. Then your once healthy cell bursts open, releasing new viruses to ____ more cells.

21. Few people ____ applied for the position meet the requirements of the company.

64. 不断变换的时尚潮流只不过是在刻意地制造浪费。