1. returned
2. had returned
3. finished
4. had finished
5. thought, had lost
6. told, had seen
7. came, had cooked
8. returned, had done
9. предложение наполовину оборвано ╮(╯_╰)╭
10. gave, had bought
11. showed, had drown
12. gave, had brought
13. saw, hadn't washed
14. understood, hadn't done
15. knew, hadn't come yet
16. woke, had gone
17. thought, hadn't come home yet
18. told, had cooked
19. found, had lost
20. came, had left