Today some students get together to talk about the future._________ will the future be like? The students make _______ about it. Listen to them:

" _______ New York City keeps going the way it is, it will be more crowded and polluted, with worse air and more litter（垃圾）. We need to learn to _______ the environment, so we will have a good place to live in. New Yorkers need to love their city. "

"I think the future will be _______ . When your house is _______ , you just need to call your robot to help you do the housework. _______ will be different: all the classrooms will have computers, and you _______ have to take your schoolbags. When you want to travel, a flying board（板）will take you anywhere. It will fly very fast, and it will only take you an hour _______ to China from the USA. "

"I think that if we walk or ride bikes more, there will be __________ pollution in the world in the future. Then we will live in a better environment. "