Key to open the box

123456789101112131415161718
Across
  1. 2. As well as, also
  2. 4. First and 14th letters of the alphabet
  3. 7. The festive season
  4. 9. Also included
  5. 10. Exam
  6. 11. At once, immediately
  7. 12. Peerless, foremost or unrivalled
  8. 14. Concrete does it on drying
  9. 16. Composed or made from
  10. 18. Take the top off
Down
  1. 1. Drinking vessels
  2. 3. Hopes and aspirations
  3. 4. The sixth tone in the scale of C major
  4. 5. Unblemished and unused
  5. 6. gift
  6. 7. Your nickname
  7. 8. Belonging to me
  8. 13. Hole in a needle
  9. 15. 2 without the w
  10. 17. 4 without the u