Задание 6.Заблаговременно спасибо!

1. When we ARRIVED at the station, it WAS RAINING.
2. My friend CAME when I WAS PLAYING computer games.
3. Many people WERE SLEEPING when an earthquake BEGAN.
4. At this time last year we WERE TRAVELLING in the mountains.
5. Yesterday from 3 to 5 o'clock I WAS LEARNING English.