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2.We were having picnic when it started to rain. 3.They were swimming when they saw a shark. 4.I was looking out of the window when it began to snow. 5.She was telling a joke when teacher came into the room.

2. we were having a picnic when it started to rain
3. they were swimming when they saw a shark
4. i was looking out of the window when it began to snow
5. she was telling a joke when the teacher came into the room