I’m hungry,can I have something________?
helps build a better world for everyone, especially children around the world.
—People have realized how important the environment is, but still trees ____in the world every year. — We must do something to stop it.
Do you know _____?
There is _____ knocking at the door. Go and see who it is.
—What was your hometown like five years ago? —It _____ very old and dirty.