TIK

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Across
  1. 2. Of vegetation extremely rich and abundant
  2. 4. Sticky
  3. 5. Collect data to find the truth
  4. 8. Deserving praise
  5. 10. Smart clever and innovative
  6. 13. Have an effect on smth especially a negative one
  7. 15. Cause water or any liquid to run out
  8. 16. Ability to recover quickly
  9. 19. Speech
  10. 20. Group
Down
  1. 1. Naive, innocent
  2. 3. Expressing praise
  3. 6. Involve oneself deeply in an activity
  4. 7. The smallest unit of a phenomenon
  5. 9. Which has become poorer in quality, spoilt
  6. 11. Deep understanding
  7. 12. Column
  8. 14. Trainee
  9. 17. Purpose
  10. 18. A natural skill at doing smth
  11. 21. The care and cultivation of crops and animals