41 . prevention ( n )
42 . abilities ( n )
43 . terrifying ( adj )
44 . arragement ( n )
45 . scientifically ( adv )
46 + 47 : economic/economically
48 . childish
49 . competitive
50 . forgotten
51 . mysterious
52 . indecisive
53 . authorized
54 . widened
55 . apology
56 . memorize