Identify the Root Words

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Across
  1. 2. mismatch
  2. 5. singer
  3. 6. improper
  4. 7. refill
  5. 8. return
  6. 9. unwrap
  7. 12. thankful
  8. 13. careless
Down
  1. 1. national
  2. 3. winner
  3. 4. artist
  4. 5. slowly
  5. 6. impolite
  6. 10. playful
  7. 11. sadness