用所给词的适当形式填空。

1. It's very nice of you _____ (invite) me to the party.

2. It's cold outside. You'd better _____ (not take) off your coat.

3. He was pleased _____ (receive) the present.

4. How many _____ (act)in this play all together?

5. At last we decided _____ (set) off at once.

6. What we have to do first is _____ (find) a solution.

7. Let me _____ (do) it for you.

8. We must try _____ (live) together happily.

9. _____ you _____ (impress) by the play?

10. I think it's hard _____ (get) to the top of the high Mountain.