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9. We were visiting our grandparents over the weekend when it (starting / started) to rain heavily.
10. My grandfather (read / was reading) the newspaper at that time.

Exercise 5. Fill in the blanks with the correct form of the verbs.
1. She ________________ (sing) a beautiful song on stage when the microphone stopped working.
2. He ________________ (study) for three hours last night when his roommate came in and started playing loud music.
3. They were swimming in the ocean all day when they ________________ (see) a school of dolphins.
4. I was finishing my work early today when my boss ________________ (call) me into a meeting.
5. We ________________ (drive) to the mountains for our vacation when we got stuck in traffic.
6. You were cleaning the entire house before the guests ________________ (arrive) when you accidentally broke a vase.
7. The dog ________________ (bark) loudly all night because it heard a noise outside.
8. He was sleeping through the alarm clock this morning when his roommate ________________ (wake) him up.
9. She ________________ (draw) a picture of her family when her little sister spilled juice on it.
10. They ________________ (climb) to the top of the mountain when it started to rain heavily.