number 4

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Across
  1. 3. appear≠
  2. 7. go on
  3. 8. reachable ≠
  4. 10. impossible≠
  5. 13. with no hope
Down
  1. 1. difficulties
  2. 2. visible≠
  3. 4. normal ≠
  4. 5. a place where the embryo grows
  5. 6. missing
  6. 9. scary
  7. 11. plane
  8. 12. 12