5．1we must go to____ early at night and get up early in the morning． 2．Children of your age need nine____sleep every night． 3．Then you____do your work well． 4．We must sleep at night_____ it is dark． 5．When day_____，we must get up． 6．Exercise can keep the body_____．
4．1．Helen was a famous dance teacher and a nice woman． 2．She didn't always have many students． 3．She taught in the same school all her life． 4．One of her students thought that she would be better than the next teacher． 5．Helen was the girl's seventh dance teacher．
