Rose has four cousins.They are Ann, Betty, Peter and Bill.Pose is the oldest of them.Betty is thirteen years old.She is two years younger than Pose and one year older than Peter.Bill is nine.Ann, the youngest is seven. Betty and Peter are good at running.But Peter runs faster.Pose and Ann like to play basketball.Rose plays better than Ann.Bill is the best singer of them five.Rose an Betty study in a middle school.Ann, Peter and Bill study in a primary school.These five children all work hard at their lessons.But Betty works the hardest. Peter is   _   years old
nine twelve thirteen fifteen