Ответ:
- 1 I fell asleep when I was studying.
- 2 My friends were looking after a rabbit until their friend returned home.
- 3 The lion was sleeping when I saw it at the zoo.
- 4 What were you doing when I phoned?
- 5 I was not watching the lion when it woke up.
- 6 The penguins were eating and the dolphins were jumping when we arrived.
- 7 The teacher picked up a pen while the students were doing their exam.
