Explanation:

1) The wounded man was being helped by him.

2). I was laughed at by me.

3). one's promises should be kept by one

4). the boy was praised by the teacher

5). the road was being prepared by them

6) the the window has been broken by whom

7) area was destroyed by the cyclone

8) theywelcomed by the people

Answer:

(1)The old man was being helped by him.

(2)I was laughed at by him.

(3)Promises should be kept.

(4)The boy was praised by the teacher.

(5)The road is being repaired.