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