The key answer of exercise 1

a)

1. will have saved
2. we will be travelling
3. won’t have finished
4. will be having
5. will have had
6. will be leaving
7. will have gone
8. will be waiting

b)

1. 'll have moved
2. will be flying
3. 'll have done
4. will have read
5. 'll be playing
6. 'll have built
7. 'll have finished
8. 'll be driving
9. will have stopped
10. Will you be going

c)

1. When will you be having your next holiday?
2. What will you be doing this time tomorrow?
3. What time will you be getting up tomorrow morning?
4. How much TV will you have watched by the end of this week?
5. Where will you be going next weekend?
6. When will you have finished your English homework?
7. How many times will you have looked at your phone by the end of today?
8. How many hours will you have spent studying English by the end of the week?