Those poor children really need a house _____.
Don’t worry, sir. I’m sure I can run _________ to catch up with them.
People have cut down many trees every year, so there will be fewer trees, ________?
Being heavy is bad for people’s health, I think you’re a little heavy. You should eat ______ meat and _________ vegetables.
Students should get a good habit of studying, you can’t do any other things while you’re doing homework. So please ___________ your MP4.
As students, we must study hard, because ___________ we study, ________ grades we’ll get.