Change the noun into a plural

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Across
  1. 4. recipe
  2. 5. project
  3. 9. sidewalk
  4. 12. student
  5. 13. year
  6. 14. idea
  7. 15. playground
  8. 16. school
Down
  1. 1. parent
  2. 2. proposal
  3. 3. teacher
  4. 5. park
  5. 6. leader
  6. 7. vegetable
  7. 8. decision
  8. 10. result
  9. 11. issue