Past Simple/Past Continious.
1)I watched/was watching a DVD when my cat jumped/was jumping on me.
2)Sue was watering/watered the flowers when it started/start to rain.
3)They were walking/walked to school last Monday because there was no bus.
4)I ate/was cating a sandwich while my parents drank/were dranking coffe. — Правильный ответ на вопрос найдете ниже