1. came, had cooked
2. returned, had done
3. entered, had opened
4. Gave, had bought
5. Showed, had drown
6. Gave, had brought
7. Saw, hadn’t washed
8. Understood, hadn’t done
9. Knew, hadn’t come yet
10. Was returning
11. Had been returning
12. Was finishing
13. Had been finishing
14. Thought
15 told, had seen
16. Woke, had gone
17. Thought, hadn’t come home yet
18. Told, had cooked
19. Found, had lost
20. Came, had left