78. A) over                 B) against              C) on                   D) behind

79. A) mess                 B) boom               C) growth               D) decay

80. A) proceeded             B) relieved             C) launched             D) revised

81. A) quickening             B) widening           C) strengthening          D) lengthening

82. A) average                B) massive            C) abundant             D) general

83. A) labels                 B) cycles              C) vehicles              D) devices

84. A) or