Spelling Round-up!

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Across
  1. 8. To keep doing something
  2. 10. A math action putting two or more things together
  3. 11. A, E, I, O, U and sometimes Y
  4. 12. Stronger than other things
  5. 13. To take up space in a place
  6. 14. To cause a change
  7. 15. Having the skill to do something
Down
  1. 1. Changing position
  2. 2. A set of words that create a complete thought
  3. 3. Shaped like a ball
  4. 4. A pain in the mouth
  5. 5. To recognize a person or thing
  6. 6. To be attached so a thing will not come down
  7. 7. To claim someone did something wrong
  8. 9. A building where sick people go for help