用所给单词的适当形式填空。

1. Have you _____ (study) any other languages in school?

2. Thanks very much for _____ (invite) us to have dinner.

3. The wonderful piece of music is so difficult _____ (play).

4. Who was _____ (happy), you or your friend Jim?

5. You need _____ (make) a new sentence.

6. He lives on the _____ (twelve) floor.

7. _____ (not write) the letter in English.