1/ The fire badly damaged the town hall.
=> The town hall was badly damaged by the fire.
2.They have to repair their garage
=> Their garage has to be repaired by them
3.The teacher is going to show us a documentary about severe floors
=> A documentary about severe floors is going to be shown by the teacher
4.The police haven't found the flood victims yet
=> The flood victims haven't been found by the police yet.
5.It is sad that many people are homeless after the floor
=> Many people are said to be homeless after the floods