！It’s dangerous to skate over there.

Don’t _____ trees. They are our good friends.

Do you know that China is one of_________countries in the world—Yes, I do. It’s much________than the U.S

21All parents are willing to risk ________ their lives tosave ________ of their children when a disaster is approaching

The number of students in our schoolabout 3,000 andthem are from the countryside.