"th" sound

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Across
  1. 3. to express gratitude to someone
  2. 6. a room with a toilet and sink
  3. 9. having a large distance from one side to the other; not thin
  4. 10. the short thick finger on the side of the hand
  5. 14. a way of doing something; a procedure
  6. 15. the direction opposite of north
  7. 16. feeling the need to drink water
  8. 17. a hard white structure in the mouth used for biting
  9. 18. not anything; no thing
Down
  1. 1. to use your mind to form ideas or opinions
  2. 2. washing the body in water
  3. 4. the number 30
  4. 5. an unspecified thing
  5. 6. referring to two people or things together
  6. 7. having little distance between two sides
  7. 8. a person who writes books, stories, or articles
  8. 11. the plural of tooth
  9. 12. a person who practices sports
  10. 13. any thing at all
  11. 14. the study of numbers and calculations