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B)

2. When he was a young man, he used to enjoy play basketball.

3. In ancient Rome, wall paintings used to be a popular form of advertising.

4. Before she learned to read, her parents used to read stories to her.

5. Before he came to Ankara, life used to be cheap in Turkey.

6. Jim used to speak German at school, but he has now forgotten.

7. Susan used to be a nurse before she got married and raised a family. 

8. Sally used to play tennis when abroad, but she prefers swimming now.

9. Before they bought their house, they used to live in an apartment.

10. While she was going to university, she used to work in a doctor's office.

11. Before he married his second wife, he used to be quite happy.

C)

used to play - used to worry - didn't use to bite - used to cry - used to be

D)

used to learn - used to do - used to read - used to learn - used to give

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