(3) Complete the sentences with when or while. Sometimes both are possible.
0. When mom was frying fish, she burnt her hand.
1. ★★★ I was roller skating, my friends were riding their bicycles.
2. I was still playing the piano ✰✰✰ everybody started clapping.
3. Elnur hurt his leg ★★★ he was playing football.
4. Ulvi and Kamil were waiting at the bus stop ★★★ the rain started.