Ответ:

1. He's very friendly, so he's popular among his colleagues.

2. It was 2.30, so they had lunch together at the cafeteria.

3. She was good at chess, so she won the tournament easily.

4. It was 11.00, so we went to bed early.

5. I'm tired, so I'm going to sit down and rest for a while.

Объяснение: