Ответ:

4 gave, had bought

5 showed, had drawn

6 gave, had brought

7 saw, hadn't washed

8 understood, hadn't done  

9 knew, hadn't come

10 returned

11 had returned

12 finished

13 had finished

14 thought, had lost

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 already left

Объяснение: