用括号内所给动词的适当形式填空。

1. I often see him _____ (play) basketball on the playground.   

2. Listen! I hear somebody _____ (sing) in the next room. 

3. He asks us _____ (clean) the classroom after school. 

4. The teacher made us _____ (stay) in the classroom.    

5. Why are they made _____ (stand) outside the fast food restaurant?    

6. He is a good boy. Don't let bad companions _____ (lead) him.