Answer:
1.My briefcase will be taken by somebody.
2.Our written work is going to be returned to us by the teacher.
3.Her report will be finished by soon by her.
4.The little boy was bitten by the mad dog.
5.Five suspects were arrested by the police.
6.He was ordered to take a long rest by the doctor.
7.Milk is going to be used for making butter and cheese by them.