(to sit) by the window when he heard the noise. We ___________ (to watch TV) when the door bell rang. She ___________ (to read) when somebody knocked at the door. They ___________ (to talk) about him when he suddenly came in.

Выполним упражнение, раскроем скобки, поставив глагол в форму Past Continuous.

1. The man was sitting by the window when he heard the noise.
2. We were watching TV when the door bell rang.
3. She was reading when somebody knocked at the door.
4. They were talking about him when he suddenly came in.

Ответ: смотри решение выше.