Помогите пожалуйста.Open brackets.1. The band ... (perform) for an hour when

Помогите пожалуйста.
Open brackets.
1. The band ... (perform) for an hour when the electricity went off.
2. I ... (look) for a new bike for two months before I found one.
3. Pete left work as soon as he ... (write) the reports.
4. Belinda ... (study) German for three years before she moved to Munich.
5. David ... (eat) by the time we got home.
6. I (wait) at the cinema for an hour before Kim finally showed up.
7. Grandma ... (go) to the supermarket before they got home from school.
8. They ... (play) football all day so they were very tired in the evening.
9. The waitress served us something we ... (order).
10. He ... (finish) making the lunch when the guests arrived?