23.　 部分动词过去式：change---changed;　want---wanted;　eat---ate;　like---liked;

　　　　　　　　　 love---loved;　have (has)---had;　

22.　 I always have a healthy meal for lunch.

21.　 I exercise every day for about 30 minutes

= I exercise for about 30 minutes every day.

20.　 like chatting with friends on the Internet

19.　 like studying / like school

18.　 a top student

17.　 not…any more 　 ( I do not eat sweet snacks between meals any more.)

16.　 They give me energy but they are not healthy.

15.　 be (not) good for.　　(I know that sweet snacks are not good for our health.)

14.　 It’s important for sb. to do sth.　 (It’s important for a dancer to be healthy.)