Complete the sentences with when or while.
1. She was eating an apple __ she bit her tongue.
2. We were driving in the car __ we saw Robin on his bike.
3. __ I was paying for the T-shirt, I realised I didn't have any money.
4. Olivia was having dinner __ the phone rang.
5. __ I was walking into town, I saw I had different socks on.​