1/ A dacing class was started last week.
2/ the accident was seen by Mr.Smith.
4/ Our written work was returned to us by the teacher.
3/my briefcase has been taken.
5/ the report has been finished by noon by her.
6/ the little boy was bitten by the mad dog.
7/ five suspects have been arrested by the police.
8/he was ordered to take long rest by the doctor

1.A dancing class was started last week 

2.the accident was seen by MrSmith

3.my briefcase has been taken

4.our were returned written work to us

5.