Time and Declining Invitations

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Across
  1. 3. I already have plans
  2. 8. I don't want to
  3. 9. I can't
  4. 11. half/30 min
  5. 13. 15 min
  6. 14. I need to take care of
  7. 18. in the morning
  8. 19. No, thanks.
  9. 20. twenty
  10. 21. noon
  11. 22. it's at six
Down
  1. 1. No, I'm sorry
  2. 2. I need to study
  3. 4. I need to do my homework
  4. 5. midnight
  5. 6. Why not?
  6. 7. at night
  7. 10. I need to help
  8. 12. in the afternoon
  9. 15. It's one o' clock
  10. 16. What time is it?
  11. 17. It's two o' clock