Il singolare e il plurale dei nomi

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Across
  1. 2. pencil
  2. 4. hamburgers
  3. 6. ice-cream
  4. 8. doors
  5. 9. male friends
  6. 13. projectors
  7. 14. water
  8. 15. window
  9. 16. houses
  10. 18. boards
  11. 21. watches
  12. 22. trash can
Down
  1. 1. female students
  2. 3. bathrooms
  3. 5. student's desks
  4. 7. problems
  5. 10. teacher's desk
  6. 11. buses
  7. 12. brothers
  8. 13. pens
  9. 17. flower
  10. 19. actress
  11. 20. nights