Unit 3 Crossword puzzle

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Across
  1. 8. thankful
  2. 11. a discussion where two or more speakers express opposing views
  3. 13. interrupt sb. when they work or sleep
  4. 14. the plural form of phenomenon
  5. 15. check
  6. 16. adapt
  7. 18. traditional
  8. 20. 游戏机
Down
  1. 1. move back
  2. 2. sth. that can causes diseases in people
  3. 3. created by people
  4. 4. + - * /
  5. 5. remove sth. that has been written or printed
  6. 6. eraser
  7. 7. stop sth. from being done or used
  8. 9. the opposite of normal
  9. 10. recognize sb./sth. and be able to say who or what they are
  10. 12. sth. used for fighting or attacking sb.
  11. 17. hard or firm and not in the form of liquid or gas
  12. 19. use sth. in a wrong or harmful way