Fill in the gaps with the missin words. помогите пожалуйста!

1. How often
2. time
3. at
4. How long
5. fly
6. How many
7. on
8. watch
9. has, at
10. on
11. never
12. How much
13. does
14. doesn't
15. but
16. quarter
17. Do
18. because, goes
19. How old
20. do