根据句意，用括号中所给单词的适当形式填空。

1. He's not going to leave until his wife ________ (come) back. 

2. He runs ________ (fast) in our class. 

3. If you finish ________ (do) your homework, you can play football. 

4. Meimei is always the ________ (one) girl to come to school. 

5. My family feed many ________ (sheep) on the farm. 

6. I live on the twelfth floor in that ________ (build). 

7. Listen! Lucy is ________ (play) the guitar in her room.