Complete the sentences with the past simple or continuous of the verbs given:
1. We were travelling fast when the train suddenly ________ (stop).
2. I met a friend while I ______ (wait) for the bus.
3. We ____ (put) our clothes on and left the house.
4. Jack ________ (get off) the train when he dropped his suitcase.
5. After the test, I _____ (have) a short chat with my teacher.
6. The teacher ___ (come) in while we were writing the essay.