Option 6

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Across
  1. 5. an airplane with one pair of wings.
  2. 6. Not sure
  3. 9. A bicycle but with one wheel
  4. 10. a plane figure in geometry that has four sides
  5. 11. When someone can leave
  6. 13. 10 years
  7. 15. Not behaving
  8. 16. Not legal
Down
  1. 1. a plane figure with eight straight sides and eight angles.
  2. 2. A shape with 5 sides
  3. 3. Put something in something else
  4. 4. Not possible
  5. 7. one “one-hundredth” of a meter
  6. 8. A vehicle with two wheels
  7. 12. Not responsible
  8. 14. geometrical figure with ‘3’ angles