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.