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 对什么有影响
14. most of the students=most student
15.shop=go shopping=do some shopping 购物
18. come home from school放学回家
19 .of course = certainly = sure当然
21. keep/be in good health保持健康