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17
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Across 1. medical 3. obligatory/required/necessary 7. more 11. antique/old/ancient 12. spectacular 13. if 15. very 16. obligatory/required/necessary 17. free/vacant/unoccupied 19. railroad (as of a) 21. for/through 22. unforgettable 24. important 26. little (quantity) 29. automatic 30. honest 31. steep/precipitous 33. well 34. simple/one-way 36. right away 38. tomorrow 40. since/from 42. too/also 44. now 45. school (as of a) 48. historical 50. own 51. with you 52. for/towards 53. later/next/then 54. forced 55. almost

Down 1. much, a lot 2. during 4. of the United States 5. famous 6. deep 8. same 9. remote 10. rapid 12. student (as of a) 14. high/tall 18. adventurous 19. frequent 20. mysterious 23. colonial 25. complete 27. incredible 28. because 32. next 35. with me 36. excellent 37. between/among 39. reduced/lowered 41. neither/either 43. other/another 46. comfortable 47. remote/isolated 49. deep 51. each