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.