Unit 01 Friendship Unit 02 Extraordinary Pets Unit 03 Overcoming a Disability Unit 04 Foolish Things Unit 05 Charities & Donations Unit 06 Unique Hobbies Unit 07 Prefudice & Misunderstanding Unit 08 Natural Disasters Unit 09 Weather & Climate Unit 10 Special Days for the Environment Unit 11 Great Inventions Unit 12 Lost Cities Unit 13 Signs & Gestures Unit 14 The Cultural Heritage of Korea Unit 15 Serious Trash Problems Unit 16 World Mysteries