.Directions: Fill in the blanks by using the information given in the blank, only ONE word in each blank ( 5 points).
81.The warning sign was put there for the _____________ (利益) of the public.
82. When I watch a football match, I am more _____________ (关切的) with the performance of my favourite player than the result of the match.
83. We are ______________ (决心，决定) not to adopt his suggestion.
84. They are doing ______________ (研究) on environment protection.
85.This music is too ______________ (过时的)to appeal to people any longer.