答案

56. whose   57. to whom   58. when     59. had seen   

60.another    61. what      62. whom  63. guidance  

64.for which   65. from which  66.other  67. which 

68. do with   69. In return  70. served as / acted as  71. Instead of   72. is in trouble / difficulty  ; turn to   

73.has been out of work / employment  

74.as if / though  ;  was at an end / came to an end   

75.is taking off