Write predictions with will / won´t or may / may not?

Write predictions with will / won´t or may / may not. - Families / go / on holiday under the sea (definite) - Green holidays / become / become / quite popular in the future (possible) - People / not have / enough money for many holidays (definite) - We / not choose / to stay in big hotels in the future (possible) - We / not want / to fly everywhere (possible) - I / never travel / in space (definite) - Holidays in space / not be / as expensive (definite) - In the future, people / go / sightseeing on the Moon (possible) ​.