Communication Puzzle

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Across
  1. 3. vehicle of communication; tongue; the speech (and writing) of a particular country, nation or group
  2. 6. preposition
  3. 7. Movement of the head to signify agreement, understanding, or assent
  4. 9. you and me
  5. 10. a thought; a mental picture
  6. 11. article
  7. 12. put in a place or position; a group of related items
  8. 14. organ of hearing
  9. 16. Form of to be
  10. 17. teach and develop the mind or character by training
  11. 18. article
  12. 20. thus
  13. 21. equally; in the same amount or degree: in the same manner, while
Down
  1. 1. express in words; speak; utter
  2. 2. half of a laugh
  3. 4. complete a school course; obtain a degree
  4. 5. move; proceed
  5. 8. language specialist
  6. 12. observe; use the eyes; have the power of sight
  7. 13. patient, untiring, indefatigable
  8. 15. Better than average; suitable, proper, not bad
  9. 19. and so forth; and others of the same kind (abbr.)