帮变一下被动语态

帮变一下被动语态
6. Parents and teachers should allow teenagers to choose their own clothes.
_______________________________________________________
7. What do people use mobile phones for?
_______________________________________________________
8. Farmers grow rice in the south of China.
_______________________________________________________
9. Businessmen brought tea to the Western World in 1610.
_______________________________________________________
10. He gave me a new dictionary this morning.
_______________________________________________________
11. How many cars did the workers in this factory make in 2004?
_______________________________________________________
12. He didn’t see me in the street yesterday.
_______________________________________________________
13. The boy didn’t throw the stone just now.
_______________________________________________________
14. I can’t repair the broken kite.
_______________________________________________________
15.He doesn’t operate this machine.
_______________________________________________________