PH and GH

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Across
  1. 2. antonym of niece
  2. 4. past tense of fight
  3. 8. part of a piece of writing
  4. 11. past tense of teach
  5. 13. a short expression that is commonly used
  6. 14. ghost
  7. 17. picture
  8. 19. an object that is given as a prize for winning a competition
  9. 20. past tense of "catch"
  10. 21. friendly sea creature
  11. 23. I have a very long trunk
Down
  1. 1. strong
  2. 3. all that is needed
  3. 5. antonym of son
  4. 6. a paper copy of a document
  5. 7. what you hear when something is funny
  6. 9. from a to z
  7. 10. used to make phone calls
  8. 12. you get this when you are sick
  9. 15. antonym of smooth
  10. 16. a child who has no parents by death or abandonment
  11. 18. two words that are pronounced the same, but have different meanings
  12. 22. science that deals with matter and energy
  13. 24. behaving badly