1.A poem was written by him
2.Some trees and flowers are being planted by the students
3.A new business is to be opened by them next week
4.All this damage couldn't have been done by children
5.He will be seen off by all of us at the airport
6.The tigers at the zoo are fed by them three times a day
7.Your homework must be handed in before five
8.she is said to be a good teacher
竟然还有人比我快!但是楼上的有些错误哦!