Unit 1 Keeping Unit 1 Keeping Healthy Healthy Lesson 2Lesson 2Words11Sentences22Exercises33Contents WORDSWord LearningheadacheWord LearningstomachacheWord LearningtoothacheSENTENCESSentence LearningWhat is wrong?I’ve got a toothache.Sentence LearningWhat is wrong?I’ve got a headache.Sentence Learning...