Past Tenses Помогите пожалуйста!

1. I ______ (meet) my friend for lunch yesterday.
2. By the time he arrived, the train ______ (leave).
3. She ______ (study) English for three years before she moved to the United States.
4. We ______ (play) soccer when it suddenly started raining.
5. He ______ (work) at the company for five years before he quit.
6. While I ______ (watch) TV, my sister was reading a book.
7. They ______ (travel) around Europe for two months before they returned home.
8. The children ______ (play) in the park when the sun went down.
9. By the time I got to the store, it ______ (close) for the day.
10. She ______ (wait) for the bus for half an hour before it finally arrived.
11. When I woke up, it ______ (snow) outside.
12. He ______ (live) in New York for ten years before he moved to Los Angeles.
13. While we ______ (have) dinner, the phone rang.
14. They ______ (study) for the exam all night but still didn't feel prepared.
15. By the time they reached the top of the mountain, the sun ______ (set).