B. Put into the correct tense the verbs in parentheses (Simple Past or Past Continuous).

1.I........ (wait) for my mother when suddenly my sister .........(arrive).
2. She......... (play) when ...........(receive) a phone call.
3. They.......(call) me when I was in my class.
4. I........... (eat) while I........(watch) TV yesterday,
5. When we .........(talk), the phone........ (ring).
6. Tom......... (listen) to the radio while I .......(watch) TV.
7. The teacher.......... (arrive) when we...... (have) lunch at the coffee shop. ​