The U.S. Postal System
| 1. Mailbox | 2. mail | 3. letter carrier |
| 4. mail bag | 5. mail truck | 6. U.S mailbox |
| 7. letter | 8. return address | 9. postmark |
| 10. stamp | 11. address | 12. zip code |
| 13. mail slot | 14. postal worker | 15. window |
| 16. (airmail) envelope | 17. postcard | 18. money order |
| 19. package | 20. string | 21. label |
| 22. tape | 23. Express Mail (pakage) |
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