Who could it be?

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Across
  1. 1. I'm sunburnt
  2. 5. Dance and sing!
  3. 6. Where's Boston
  4. 7. Shhhhh stop talking SHhhhh
  5. 11. Go and get your tablet.
  6. 12. I'll be their partner
  7. 14. Pause, Whisper, whisper, Pause, whisper
  8. 17. I've finished my work quickly and neatly
  9. 19. Stop talking!!!
  10. 20. I like Unicorns
Down
  1. 1. I like stuffed animals
  2. 2. I didn't Choke him!
  3. 3. I need the calm corner
  4. 4. Do I have to?
  5. 8. Stop swinging on your chair!
  6. 9. Away again
  7. 10. Late again
  8. 13. Haven't heard him speak today
  9. 15. I don't want to do my work in another room
  10. 16. Who stole Mentos from Mrs Price?
  11. 18. We will miss her