Divide these sentences into two parts: "a past action that was happening" and "another action interrupted"

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Exercise 4. Divide these sentences into two parts: "a past action that was happening" and "another action interrupted".
1. When I was walking in the park, I saw a rainbow.
a past action that was happening
2. When she was studying for her exam, she heard a loud noise.
a past action that was happening
3. When they were cooking dinner, the power went out.
a past action that was happening
4. When he was driving home, a deer ran across the road.
a past action that was happening
5. When we were playing soccer, it started to rain.
a past action that was happening
6. When she was painting, she accidentally spilled some paint.
a past action that was happening
7. When he was reading, he saw a spider crawling on the page.
a past action that was happening
8. When they were watching TV, the show suddenly ended.
another action interrupted
another action interrupted
another action interrupted
another action interrupted
another action interrupted
another action interrupted
another action interrupted