Ex.4 Past Simple или Past Continuous?

I ___ TV when the lights went out.

She ___ her key while she was running.

When I arrived, they ___ dinner.

He ___ the door and went in.

What ___ you doing at ten?

While we ___ , it began to snow.

I ___ breakfast at 7 a.m. yesterday.

She ___ when the teacher entered.

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