根据句意及所给提示完成单词。

1. That sounds i______. I like it very much.

2. —How o______ do you come to school late?

    —Never.

3. The teacher gave us some ______ (建议) on how to learn English.

4. I had a toothache. So I had to go to the d______.

5. What are you ______ (计划) to do there?

6. ______ (袋鼠) come from Australia.

7. It's i______ for us to learn English well.

8. U______, he was hurt (受伤) in the car accident.

9. We should try to keep the b______ of nature.

10. The workers ______ (建设) a bridge over the river.