1)
1. he was robbing
2. What were you doing between one and two? ... - I was playing the piano ...
3. I was having a bath
4. I was sitting
5. Tom was crossing the street
6. I was waiting
7. The student was replying
2)
1. What was the monkey playing with?
2. Where were the white bears swimming?
3. Was it raining?
3)
1. c) Easter
2. c) Trafalgar
3. a) Christmas Day