The "oi" sound: oi or oy

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Across
  1. 4. a vertex
  2. 5. half a hundred
  3. 6. become part of
  4. 8. a vacation
  5. 9. kings and queens
Down
  1. 1. ten more than half a hundred
  2. 2. went bad
  3. 3. like a cream
  4. 6. top of the Mood Meter, yellow
  5. 7. to pull along the ground