49. How to keep stress proper:(1) Have a balanced life.(2) Have and have healthy food.

29. Some students have difficulty _____ English, so they often ask their English teacher for help. 

56.众所周知，肺癌至少部分是由于吸烟过多而引起的。

64.我们已研制出了能大规模提高生产的方法。

58.他会说点汉语，因此能很容易地适应北京的生活。

（ ）13. Glasses help people to remedy their eyes.

27. How much _____ she looked without her glasses!

45. What is the passage mainly about?

37. What does the underlined word “ despair” mean?

23. Not until the game had begun _____ at the sports ground. 

（ ）53. Frank showed his ability of organization when he was still a very young boy. As a student, he wishes he could do something to improve the relationship between the teaching staff and the students. And, as a matter of fact, he has that ability.

57.要是我们接受了他的建议，我们本可以避免犯这样的错误的。