Sort 6 -er -est -ier -iest

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Across
  1. 2. to be more tricky
  2. 4. to be nicer
  3. 6. to be more quiet
  4. 7. to be the most strange
  5. 9. to be more clean
  6. 12. to be the most clean
Down
  1. 1. to be more early then someone else
  2. 3. to nicest
  3. 5. to be more empty then something else
  4. 8. you dont know them
  5. 10. to be the most early
  6. 11. to be the most empty