Fill in the blanks in the sentences with 'used to' or 'didn't use to'.

1. We used to live in a flat but a month ago we bought a house. 2. I didn't use to like classical music but now I go to the conservatoire every month. 3. He used to have a lot of friends but last month his family moved to another town and he doesn’t know anyone. 4. My brother didn’t use to study hard but this year he is going to take an entrance test so he is studying all the time. 5. Kate used to eat a lot of junk food but now she prefers healthy food. 6. Our teachers used to give us less homework when we were in a primary school. 7. Her friend used to work as a cleaner because her family didn’t have enough money.