Ответ:
1. My mother was lying on the sofa at 4 o'clock yesterday.
2. Kevin was travelling about the city at 7 o'clock yesterday.
3. The Smiths were having tea at 5 o'clock yesterday.
4. Boris and Kate were playing badminton at 9 o'clock yesterday.
5. Peter was choosing a present for his friend at 12 o'clock yesterday.
6. Dan was sitting in front of me when the doorbell rang.
Объяснение: