64. 散步有益于健康，我相信这一点对年轻人尤其重要。

30. It is prohibited by law to mail parcels that might prove ____ in transport.

21. He told me how he had given me shelter and food, otherwise I ____ of hunger.

2. 

40. What can be concluded about Guranlao from the last paragraph?

( )15. Even if the one you are talking with is impolite, you should also respond to him or her for politeness.

39. What does Celine particularly like about Guanlao’s library?

36. The writer introduces the subject in the first paragraph ____.

66. In recent years, an increasing number of college students are involved in various volunteering causes. There is no denying that volunteers make great contributions to society. On the one hand, in any big events such as Beijing Olympic Games and Shanghai World Expo, human resources are surely in great demand. Whatever a volunteer can do is helpful for the event. On the other hand, students can reap great benefits from volunteering work. Various experiences in their volunteering practice guarantee their brighter future career.

46.To protect your computer system from virus infection, delete ___46___.

3.

26. Before talking about the subject in details, ____.