Try this :

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Across
  1. 2. A mother has 6 daughters and each daughter has one brother, how many total children does she have?
  2. 5. Largest Ocean in the world
  3. 6. I have two faces, but no eyes, mouth or nose. What am I ?
  4. 7. I have keys but no lock, space but no room, you can enter but can't leave
  5. 9. The more you take, the more you leave behind
  6. 12. I get smaller the more I word
Down
  1. 1. Capital of Australia
  2. 3. A farmer has 17 sheep, all but 9 run away. How many are left?
  3. 4. I go through cities and fields, mountains and villages, but never move. What am I ?
  4. 8. A doctor gives you three pills and tells you to take one every 30 minutes. How many hours will they last?
  5. 10. You are running a race, you pass the person in second place, what place are you in now?
  6. 11. What common measurement increases, but never decreases?