1.School clothes must be worn at school by students.
2.She often is seen under the tree by people.
3.Tea was brought to weastern world by people.
4.The light was turned off by someone.
5.I will be asked a question next class by the teacher.
6.A pen is used to write by us.
7.This tool was invented in 1908 by them.
8.Plants have been planted for more than 100 years by the farmers.
9.The bad ban was caught just now by them.
10.Many desks and chairshave were mended by them.
11.A bridge is building now by the workers.