5. Playing computer games is delightful, but _______ (spend) too much time on it may do harm.

4. On May 12, 2008, sichuan _____________ (hit) by a strong earthquake which killed many people and distroyed many buildings.

3. We should think about what we can do ________ (keep) animals and plants from becoming endangered.

2. It was a pity that you _____________ (not attend) the meeting last Friday afternoon.

1. I’ll tell our monitor the good news as soon as he ____________ (come) back to school.

10. How are you going to _______________ (证明) that it is very difficult for giant pandas to survive in the wild?

9. The tourists had no ______________ (选择)but to wait for the next train.

8. I don’t think the watch gives you good ______________ (价值) for your money.

7. _____________ (医疗的) workers are badly needed in those earthquake-hit areas.

6. Like many famous scientists, Li Siguang ____________ (致力于) himself to the study of science.