九年级的几道英语题，求高手解答！！！！

Paper making was invented in Eastern Han Dynasty.
Stamps was used for sending letters.
Teenagers should be allowed to choose their own clothes.
What mobile phones are used for?

1paper making was invented（by people）in Eastern Han Dynasty
2stamps are used（by people）for sending letters
3teenagers should be allowed（by parents and teachers ）to choose their own clothes
4what are mobile phones useed（by people）for

paper making was invented by people in Eastern Han Dynasty.

stamps for sending letters.are used by people
teenagers should be allowed to choose their own clothes by parents and teachers
what are moblies phones used to for people

应该是这样吧 【【【

1.Paper making was invented in Eastern Han Dynasty.
2.Stamps were used to send letters.
3.Teenagers should be allowed by parents and teachers to choose their own clothes.
4.What was mobile phone used for?