=>
79. B -> to finish (it is adj to V)
80. D -> about encountering (anxiety about
81. C -> possible (it is adj to V)
82. B -> to search (one's responsibility is to V)
83. B -> returning (look forward to Ving: mong đợi -> háo hức)
84.C -> would (were entirely confident -> would V)
85. A -> to crowning