Ciaran's Crossword spelling homework

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Across
  1. 2. someone whos really smart?
  2. 4. whats a person you don't know?
  3. 5. lines and shapes in maths?
  4. 7. animal thats really tall?
  5. 8. whats really big?
Down
  1. 1. something unsafe?
  2. 3. really clever?
  3. 6. list of pupils?