完形填空...We often think about future.we often want to know w__

完形填空...
We often think about future.we often want to know w____ the world will be like in one hundred years'time
T____ of space.Maybe there will be a space station on the moon in the future.Maybe people will be able to v____ the moon as tourists.Scientists will make cheap r_____ for space trvel.When that time comes ,people will be taking h_____ in space .People will make more progress in medicine,too.There will also be less and less p_____ on the earth in one hundred years' time .And then people on the earth will live m____ healthily .
As there will be more and more people in the world,nearlyevery corner in the world will have been developed--e_____ Antarctica .we will have used up most of the earth's land to b____ our cities,so there may be some cities on the water.The Japanese already have plans of this kind.And there will be cities u_____ the sea,too.