Surprise

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Across
  1. 3. Particular
  2. 7. Preposition
  3. 9. A vowel
  4. 10. Multiple of two
  5. 12. To keep intact
  6. 13. Roman numeral M
  7. 16. An unspecified or unknown thing
  8. 17. Last twenty-four hours
  9. 19. Definite article
  10. 20. Pronoun that refers to people in general
  11. 21. Pronoun
  12. 23. After one
Down
  1. 1. 3rd person singular present indicative of be
  2. 2. Appropriating
  3. 4. Significant
  4. 5. Of the same appearance
  5. 6. The first month of the year
  6. 8. United
  7. 11. A simple past tense and past participle of will
  8. 12. To use jointly
  9. 14. A particular day of the month
  10. 15. This present day
  11. 18. Plural of be
  12. 20. Accompanied by
  13. 22. Preposition