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Across
  1. 2. a row　　　　one after another
  2. 4. having a pointed edge
  3. 5. to a medium degree
  4. 6. to follow the movement of something
  5. 7. a mark left by a foot
  6. 8. a large animal that lived millions of years ago
  7. 12. a long, hard, pointed object
  8. 13. lack of success
  9. 16. the way someone or something acts
  10. 17. harm or injury
  11. 18. becoming worse or going backward
  12. 19. to keep safe from harm
  13. 23. a person with special knowledge
  14. 25. the world　　　　in many parts of the world
  15. 28. feeling unhappy because something is not as expected
  16. 29. to explain the meaning
Down
  1. 1. to work or operate
  2. 3. to take part in something
  3. 9. a person working for the government
  4. 10. a group of similar living things
  5. 11. committed to　　　　to give time and effort to something
  6. 14. someone you live or work with
  7. 15. into　　　　to enter by force
  8. 19. a survey of people's opinions
  9. 20. to watch carefully
  10. 21. a general direction of change
  11. 22. a small simple house
  12. 24. facts that show something is true
  13. 26. a system where people vote for leaders
  14. 27. things people are allowed to have or do