21. The job was hard, which made me so tired that I almost quit half way.
The job was hard, boring and seemed endless, which made me so tired that I almost quit half way.
(Not only …but also…)、(Because…)、(because of…)、(As long as…)、(so long as…)
22. The Red Star Television Factory, which produces TV sets of quality, was set up in the 1980's.
23. The E-reading room, where we can send e-mails to all parts of the world, is open to both teachers and students.
24. I feel I will be fit for the job needed in your company.
25. The number of workers and engineers has risen(更高级词汇：increased) to over 2000, and 80% of them are college graduates.
26. There is an increasing tendency that students own their mobile phones on campus.
27. Now in the rural areas, there are many children out of school. I think one of reasons is that their families are too poor to afford their schooling.
28. People should pay more attention to the education of children because they will play a very significant /(important) part/(role) in the future of our country.
29. In 2008, you will see Beijing as beautiful as a garden, with cleaner water and clearer sky.
30. How nice to hear from you again.