what'smissing?

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Across
  1. 4. is very sweet
  2. 5. is ready
  3. 6. is round
  4. 8. is full of cars
  5. 9. is for lunch
Down
  1. 1. runs fast
  2. 2. has long sleeves
  3. 3. is an adjective
  4. 7. filled with water