1)1.I bought the bar of chocolate when I was shopping in the supermarket
2.Ben losed his camera when he was taking photos in the bowling centre
3.My cousin catch that cold when he was boating in a boating lake in the park
4.She saw her techer when she was having a holiday in the UK
5.They have learned the English language when they were living in England
6.She heard that song when she was listening a teengers concert at school
7.He broke his bicycle when he was riding it in the park
2)1.The postman brought the letter when I was having a lunch
2.It started to rain when I was riding a bike in the park
3.The mobile rang when they had entered the theatre