you know your stuff

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Across
  1. 3. makes you smart
  2. 4. something you write with
  3. 6. first
  4. 7. Flying mammal
  5. 8. what you are doing right now
  6. 10. third
  7. 12. second
Down
  1. 1. that you are using
  2. 2. Large marsupial
  3. 4. always use
  4. 5. they are all straight
  5. 8. Likes to chase mice
  6. 9. Man's best friend
  7. 11. Has a trunk