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