I think our life will be very different in 100 years.
First, people won't live on the earth. 1.
B
Special machines will provide (提供) air and light, but the environment won't be the same. Trees and plants won't grow because there won't be any soil (泥土). 2.
D
Most of food will be in the form of a pill. 3.
E
Second, I think people's everyday life will be different. They won't have to work long hours, because computers and robots will help them. No one will have to do housework. So, people will have more free time and they will be able to enjoy the things they like—sports, for example. Finally, I believe that everyone will be able to travel to the moon for a holiday.
In a word, 4.
C
I believe the future world will be an interesting place to live in.