---I have finshed my homework ,let’s watch the program I AM A SINGER on Hunan TV.---_________.
—How many students are there in the classroom? —_____ I don’t know where they have gone.
The rubbish _____ is produced every day is becoming a serious problem in cities around the world.
More and more trees were cut down. _____, many animals are dying out.
We should often keep _____ touch with each other, because we are good friends.
—What do you think this coat is made _____? —Wool. It’s used for _____.