Unit 1 Friendship Unit 2 Dealing with Cultural Differences Unit 3 One World Unit 4 Explaining Processes Unit 5 Memory Unit 6 Wealth Unit 7 Anti-smoking Unit 8 Aging Unit 9 War Unit 10 Addiction Unit 11 Home-schooling Unit 12 Opinion polls Unit 13 Reality TV Unit 14 That's Life Unit 15 Our mother earth Unit 16 Crime and punishment Test 1 Test 2