Time and Declining Invitations

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