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1. I was doing my morning exercises at 9 o'clock yesterday morning.

2. We were watching a movie at this time on Sunday.

3. He was sleeping during the Math lesson.

4. Mary was going to Kyiv from 1 to 2 o'clock yesterday.

5. It was raining all day last Monday.

6. We were discussing that with him at 7 o'clock yesterday evening.

7. He left an hour ago. - Past Simple.

В последнем предложении не может употребляться Past Continuous.

Это ошибка.