A puzzle

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Across
  1. 3. animal like a llama
  2. 5. being from space
  3. 6. type of maths
  4. 8. your signature
  5. 11. very old
  6. 13. type of sale with bids
  7. 14. your birthday
  8. 15. where you catch a plane
  9. 16. separately
  10. 17. when you try to get a job
Down
  1. 1. very bad
  2. 2. tool for chopping things
  3. 3. scared
  4. 4. flying machine
  5. 5. month of the year
  6. 6. juicy fruit with a stone in it
  7. 7. vehicle to carry injured or sick
  8. 9. animal like a crocodile
  9. 10. ships drop these in the sea
  10. 12. to reply
  11. 13. later than or behind
  12. 15. cross
  13. 16. space between two lines that meet