SINGULAR TO PLURAL CROSSWORD

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Across
  1. 4. piano
  2. 7. potato
  3. 9. watch
  4. 12. roof
  5. 13. class
  6. 15. spy
  7. 16. baby
  8. 18. fish
  9. 20. sheep
Down
  1. 1. loaf
  2. 2. woman
  3. 3. child
  4. 5. ox
  5. 6. Japanese
  6. 8. marker
  7. 10. chair
  8. 11. toy
  9. 14. leaf
  10. 17. bus
  11. 18. foot
  12. 19. tooth