44. C　 由：help athletes know how to form teams to compete；对应Athletes form teams that compete in a variety of sports；

43. F　 由as a news reporter；对应 Work in a Media Center，

42. A　 由can I still apply and how can I apply for it；just read the application guides or call at Olympics Volunteer hotline+86-10-12308。

41. B　 由willing to set up a school …对应Set up Trailing Schools for volunteers in China。

40．but，nothing but的固定结构，“除……之外，别无；只有”。

39．when，考查由when引导的时间状语从句。

38．thankful，考查thank的形容词。

37．crying考查hear somebody doing something 的结构。

36．happy,考查happy 的副词。