Помогите пожалуйста. Очень надо четвертная решается
2. didn’t hesitate
3. had discovered
4. had ever gone
5. believed
6. had never existed
7. felt
8. had vanished
9. became
10. had hidden
11. believed
12. still kept
13. set off
14. was looking forward to
15. climbed
16. studied
17. were resting
18. noticed
19. was waving
20. shone