6. People collect and send glass to the factories.
-> ....Glass is collected and sent to the factories.......
7. They told Mai to leave the place.
-> ..Mai was told to leave the place.....
8. Did you finish your homework?
-> ...Was your homework finished?......
9. Do they help their teacher?
-> ...Is their teacher helped?.....
10. We use tree leaves to wrap things.
-> ...Tree leaves are used to wrap things.....