短文填空(5分)

worry, never, bad, habit, healthy

 
Many children love junk food(垃圾食品). It’s ____  for their health. Their parents don’t want them to eat too much junk food. Although(尽管) they know it’s not a good   ____, they still eat it. Some of them eat this kind of food every day. Some only once or twice a week.
Paul is a little unhealthy. He ____ exercises. He eats lots of junk food because he loves it. When he has money, he’ll buy junk food. His parents _____ about him. But he says, “Maybe I’m not very _____, but I enjoy myself.