用括号内所给词的正确形式填空。
1. Most _______ (busy) letters are written in English.
2. Project hope is an _______ (organize) that helps children go to school.
3. He is one of _______ (famous) actors in our country.
4. The principle will give us a _______ (speak) tomorrow afternoon.
5. There will be a musical _______ (perform) in the show.
6. The girl often give out leaflets _______ (ask) people to donate money.
7. It was my job _______ (introduce) each star.
8. I _______ (help) with a charity show this time last week.
9. This is the best model I _______ ever _______ (see) .
10. I hear the show _______ (hold) in a middle school next week.
11. A new bridge_______ (build) in my hometown last year.
12. I hope _______ (be) a doctor after I know something about ORBIS .