Surprise

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