1) people (will be using) solar energy extensively
2) people (will have used) up all natural resources of oil
3) people (will be travelling) into space on a regular basis
4) people (will be eating) only genetically engineered food
5) traditional farms (will have disappeared)
6) many new galaxies (will have been discovered)
7) Mars and Venus (will have been investigated) and (described) in detail
8) scientist (will be studying) chances of people setting down in other galaxies