4.

50.If an email needs only a short answer, you should   50    . 

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.

( )52. Learners can get credits by attending short courses.

( )51. Some education institutions provide programs which offer credits to help CE students get some recognized industry qualifications.

47.Prioritise your emails according to the sender, subject and ___47____.

24. Although I spoke to her about the matter several times, she took little ____ of what I said.

27. It took her a while to ____ living alone.

32. She had to ____ her umbrella from the Lost Property Office.

20. By the time the fire engines arrived, the house ____ to the ground.

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

9.