Mary has four cousins（表兄妹）They are Betty, Peter, Bill and Ann. Mary is the oldest of the five. Betty is thirteen years old. She is two years younger than Mary and one year older than Peter. Bill is nine, and Ann, the youngest, is seven.

　　Betty and Peter are good runners. But Peter runs faster. Mary and Ann like to play basketball. Mary plays better than Ann. Bill is the best singer of the five. Mary and Betty study in a middle school. Peter, Bill and Ann study in a primary school（小学）The five children all work hard at school. But Betty works hardest.