Срооочно, помогите пожалуйста с заданием. Дам много баллов.

2. Mum used to drink coffee. 3. We used to eat meat. 4. People used to drop rubbish. 5. All the energy used to come from fossil fuels. 6. There used to be more animals. 7. We used to do no exercise. 8. I used to watch TV.