Oslo's crossword puzzle (Savvas story "Life at the top")

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Across
  1. 2. do well or be the best at something
  2. 4. a reason for doing something
  3. 5. the ability to keep going
  4. 6. the ambition or motivation to carry on
  5. 7. competition
Down
  1. 1. how high up?
  2. 3. the ability to contain something