2. look after = take care of 照顾
4. healthy lifestyle 健康的生活方式
6. keep healthy=stay healthy 保持健康
8. take more exercise 做更多的运动
13.make a difference to 对......有影响/作用
14. most of the students=most students
15. shop=go shopping=do some shopping 购物
16. be good for 对......有益
18. come home from school放学回家
19. of course = certainly = sure 当然
20. get good grades 取得好成绩
21. keep/be in good health 保持健康