Here are the complete sentences using "will" or "won't":

9. More people **will** live/work in the cities.

10. Non-renewable sources of energy **will** run out in the future.

11. They **won't** get tickets for the concert.

12. Will people all over the world **speak** the same language in the future?

13. The dog **will** bite you.

14. Where **will** you live in ten years?

15. More and more people **won't** travel by motorbikes in the future.