Class 1. The Solar System
Class 2. Wars and Revolutions
Class 3. Film and Play
Class 4. The Great People
Class 5. Places and Neighbors
Class 6. American History
Class 7. Music
Class 8. Natural Disaster
Class 9. Philosophy
Class 10. Art
Class 11. The Ancient Culture
Class 12. Weather Forecast
Class 13. Craft
Class 14. Poets and Novelists
Class 15. Ecosystem
