Understand that risk taking is a natural part of adolescent development. "A parent's job is to help keep that risk taking in safe and appropriate bounds," says Carol Emig, president of Child Trends, a Washington, D.C.-based research organization. Believe it or not, kids want and respect their parent's advice, even if they don't admit it to their parents, according to national surveys of adolescents. "The single most important thing is to build a strong and positive relationship with your kids," says Emig. Here are the top risks and how to talk to your teen to keep him or her as safe as can be.