Change the noun into a plural

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