1. When my mother came, I was doing my homework
2. Vicky was cooking the supper, when suddenly knocked the door
3. When I came home, my parents were watching TV
4. He was driving a car, when somebody called him
5.He was reading a new magazine, when his sister entered the living-room
6. Nick broke his leg when he was skiing.
7. My sister and I were playing a computer game when the doorbell rang.