Unit 1 People Unit 2 Women at Work Unit 3 Tipping Unit 4 Study in USA(Ⅰ) Unit 5 Study in USA(Ⅱ) Unit 6 Computers Unit 7 Cultrue Customs(Ⅰ) Unit 8 Culture Customs(Ⅱ) Unit 9 Marriage and Divorce Unit 10 Diet andHealth Unit 11 Business Unit 12 Environment Unit 13 Agriculture Unit 14 LanguagesUnit 1 People