The Final Clue

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Across
  1. 2. to search and discover
  2. 3. "ing" opposite of still
  3. 4. moderately enjoys
  4. 9. north, south, east...
  5. 10. the puzzle you're doing now
Down
  1. 1. harnessed treetops experience
  2. 3. referring to oneself
  3. 5. not out
  4. 6. not he
  5. 7. tall plants
  6. 8. tenth most common word in english language
  7. 9. ___? what? where? when? why? how?
  8. 11. second most common word in english language
  9. 12. do in the past