For each sentence, choose the action that happened first.

1. James was riding a bike when he saw his best friend crossing the street. ...

2. When she came to the dancefloor, her favourite song had already finished. ...

3. We were having a great party when suddenly the lights went off. ...

4. I boarded a plane and realized I'd left my earphones in the airport lounge. ...

5. I saw those trainers on sale and bought them immediately. ...

6. They had been playing football for 2 hours when they realised that they have missed a lecture. ...

7. He had been talking to the woman for 30 minutes when he realised he hadn't introduced himself. ...