Fill in blanks with the Past Progressive or the Past Simple Tense of the verbs in margin. We ... to a lecture yesterday

1. We were listening to a lecture yesterday at ten o\'clock. 2. She was playing the piano from 11 till 12 o\'clock. 3. When he came in, I was doing my exercises. 4. What were you doing yesterday at 8 o\'clock? 5. Yesterday when I was reading the newspaper, my sister was listening to a concert over the radio. 6. She was looking out of the window when I saw her. 7. I was walking along the street with my friend when the car passed by.