1. While they ___were waiting_______ (wait) for the train, it ___started_______ (start) to rain.
2. I ____was reading______ (read) a book when my friend __called________ (call) me.
3. When I ___opened_______ (open) the door, the cat ___run_______ (run) outside.
4. He ____hurt______ (hurt) his leg while he ___was playing_______ (play) football.
5. We ____were eating______ (eat) dinner when the lights ____went______ (go) out.
6. While she _____was talking_____ (talk) on the phone, her baby ___cried_______ (cry).
7. They __________ (watch) TV when the power __________ (go) off.
8. When she __came________ (come) home, her husband __was cooking________ (cook) dinner.
9. I ____was cleaning______ (clean) the kitchen when the doorbell ___rang_______ (ring).
10. He ______fell____ (fall) off the bike while he ____was riding______ (ride) it.