Singular to Plural Crossword Puzzle

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Across
  1. 2. box
  2. 6. leaf
  3. 7. hamburger
  4. 9. book
  5. 10. sister
  6. 12. CD
  7. 13. question
  8. 15. watch
  9. 17. country
  10. 18. brother
  11. 20. cat
  12. 21. lily
  13. 22. apple
Down
  1. 1. cap
  2. 2. bus
  3. 3. class
  4. 4. park
  5. 5. day
  6. 8. newspaper
  7. 9. bag
  8. 11. student
  9. 12. city
  10. 14. pen
  11. 16. room
  12. 19. magazine