Write the opposite

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Across
  1. 1. fast
  2. 2. good
  3. 4. poor
  4. 6. empty
  5. 8. weak
  6. 9. beautiful
  7. 10. cold
  8. 11. right
  9. 12. old
Down
  1. 1. big
  2. 3. the same
  3. 4. wrong
  4. 5. difficult
  5. 7. dark
  6. 11. short