Ответ: Задание 11. will have been travelling
Задание 12. will see
Задание 13. will / be using
Задание 14. will have gone
Задание 15. will not have completed
Задание 16. is sleeping
Задание 17. will have left
Задание 18. am flying
Задание 19. arrives
Задание 20. will have finished