Aims：
1. Vocabulary: diet; balance; fry; ought to do sth; lose weight; raw; get away with; tell a lie; win…back; strength; consult
2. Talk about healthy eating
Step 1. Vocabulary
1. go/be on a diet ________________
他在节食所以他不想吃太多。 He ____ ____ ____ ____,so he doesn’t want to eat too much.
2. keep a balance between …and …__________________________
务必保持学习和休息的平衡。___________________________________________
