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$@Shiro$

4. was standing

5. had met

6. was riding

7. was living

8. hadn't wore

9. went, had read

10. was walking

11. went

12. had gone...went

13. was studying...was having

14. were dancing.

15. were sitting.

1 .after David had gone home, we arrived.

2. Before we took a look around the shops, we had lunch.

3. When we got out of the office, the light had gone.

4. By the time we started our work, she had explained clearly.