What is the correct form of the verbs in the sentences provided?

Here are the completed sentences with the verbs in the correct form of the 'past perfect continuous': 1. Sophie **had been painting** the walls all day before she finished them. 2. **Had you been waiting** long when the boss announced that he couldn't see you? 3. Tom **had been looking** for a job for six months when he found one. 4. We **had been watching** TV for half an hour when the doorbell rang. 5. They **had been sunbathing** for an hour when it started to rain. 6. Stan **had been working** as a postman for forty years when he retired. 7. I **had been living** in France for ten years when I met my husband.