Underline the correct verb form in each sentence.
1. While I was doing/did my homework, I had a good idea.
2. Jim was breaking/broke his leg when he was playing golf.
3. When I arrived, I was going/went into the kitchen.
4. We were finding/found an old box while we were digging in the garden.
5. I was seeing/saw an old friend while I was waiting for the train.
6. While I had /was having a bath, the phone rang.