Study hall of justice

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Across
  1. 3. poison ivy
  2. 5. school
  3. 8. since kid
  4. 9. secret country
  5. 11. principle
  6. 13. joker
  7. 16. alien
  8. 17. robot
  9. 19. basement
  10. 20. butler
Down
  1. 1. cat women
  2. 2. home
  3. 4. hometown
  4. 5. wonder women
  5. 6. bully
  6. 7. PE
  7. 10. god spices
  8. 12. principals daughter
  9. 14. alien spices
  10. 15. batman
  11. 18. English teacher