They sound the same

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Across
  1. 1. Likes to chase mice
  2. 3. going somewhere
  3. 4. Man´s bestfriend
  4. 5. opposite of hi
  5. 8. Large marsupial
  6. 9. Flying mamal
Down
  1. 2. more than one
  2. 3. in addition
  3. 4. opposite of night
  4. 5. to purchase
  5. 6. Has a trunk
  6. 7. opposite of sad