The Mo You Know with Greek and Roman Numerals

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Across
  1. 1. This means 100 and a half ____ centennial
  2. 5. Steve Irwin died this year (10 years from 2016)
  3. 6. Solitary is a game played _?
  4. 8. Decibels is on a scale of 1 to _?
  5. 9. A uniform makes a team _?
  6. 10. To annihilate something is to make it _?
  7. 14. 2011 was a what- - - -de ago?
  8. 16. This year in Roman numerals
  9. 18. Duet includes _ people?
Down
  1. 2. A septet has_ member?
  2. 3. A prototype is a _ of its kind?
  3. 4. The upcoming Superbowl in 2022 is Superbowl L- -
  4. 7. A semicircle is what of a circle?
  5. 8. pregnancy is divided into a _mester
  6. 9. Halloween is in ___ber?
  7. 11. A _agon has 7 sides
  8. 12. This is 55 in roman numerals.
  9. 13. Earth is cut into _ hemispheres?
  10. 15. This means both a- - -?
  11. 17. This number is at the top of Big Ben's Clock Face X_ _.