11. The habits of living things and people’s actions are very important to ______ (生态学).

10. We require _____(遵守) the order of traffic lights while crossing roads.

9. Make sure the belt is well _____(扣住) before the plane takes off.

8. There are always news ________ (提要) before seven on CCTV every day.

7. When you fail doing something, you had better not be ________ (气馁). Instead, you must try your best.

6. I’m sure china will be an _______ (先进的) country in the future.

5. Do you think everybody must have __________(责任) to the family and society.

4. What the first Chinese astronaut, Yang Liwei did is of great _____(价值) to us.

3. We should have good _______ (态度) to our life and work.

2. It’s very important and necessary to develop the _______(建设) of the country.