Headway Advanced Unit 1 – Animals Unit 1 – Brains Unit 1 – Environmental Problems Unit 1 – Intelligence Unit 1 – Natural Wonders Unit 2 – Communication Unit 2 – Aging Unit 2 – Languages Unit 2 – Learning English Unit 3 – Gerunds and Infinitives Unit 4 – Brains Unit 4 – Intelligence Unit 4 – Passive Voice Unit 4 – Transitions Unit 5 – Customs Unit 5 – Immigration Unit 8 – Customs Unit 8 – Ethics Unit 9 – Music Unit 9 – Transitions Unit 10 – Health Unit 11 – Computers Unit 11 – Technology