Ⅴ. 短文填空
从方框中选择适当的单词并用其正确形式填空，使短文完整、通顺（每词限用一次）。
know, little, human, future, online, appear, predict, few, during, everything
What will our world be like in 2200? Maybe no one 31. , because we never know what will happen in the 32. . But it's very interesting to make a few 33. .
Water will become as expensive as oil because many rivers will 34. . We will have to save water and pay more for clean water than before. Cities will be very big and crowded with people. There will be 35. trees and more pollution. The environment will be in great danger.
Students won't go to school. They just stay at home and study 36. . Students from all over the world may study together on the internet. It's common for them to do their homework and exercises on the computer.
Each family will have a robot. You can ask it to do almost 37. for you. It will serve you twenty-four hours a day. The robot will look like a 38. being. It can talk with you when you are alone. People will have 39. time to work and more time to travel.
The vehicles(交通工具) will fly freely in the sky because every vehicle will have wings. They will take you to any place. You can go to sleep 40. your travel when you feel tired. All vehicles will be safe because robots drive them.