Помогите, английский 7 класс

1. I used to ride my bicycle to school.
2. I used to study Japanese.
3. I didn't use to do exercise before.
4. My classmate didn't use to study hard.
5. A long time ago, people didn't use to have electricity.
6. I used to be lazy.
7. A long time ago, people didn't use to have TV.
8. Sarah used to be short when she was younger.