Если, я не ошибаюсь, то тут надо вставить глаголы с Past Continuous. Ну ок...
1. was opening
2. was opening
3. was opening
4. was eating
5. was eating
6. was eating
7. was eating
8. was eating
9. was eating,
если я конечно не ошибаюсь. А вообще легкое задание, чего ты?!