4. 为看NBA比赛而旷课，那可不行。(question)

3. 在空调房内时间过长，很容易染上感冒。(likely, infect)

2. 走了30里路后，他终于见到了那位著名的艺术家。(cover)

1. 她不会说话，但能凭借手势与人交流。(by means of)

10. No one knows when such a custom first 　　　　　　.

9. Do you think letters 　　　　　　e-mails in the future?

8. We 　　　　　　letting out a cry of joy as soon as we heard the exciting news.

7. For some children in parts of the world, accepting education is still 　　　　　　due to poverty.

6. In China it seems very common that a young adult 　　　　　　　their parents economically.

5. He wondered how they 　　　　　　that problem.