71. Due to poor management , the factory is deeply _______ __________.(债台高筑).
72. _____________ ____________ ______________,(出于好奇)he pulled down the handle of the fire alarm.
73. It’s illegal to read people’s private letters without _____.(许可)
74. Could you tell me whether there is a c______________ between smoking and lung cancer?
75. The condition prevents the blood from c__________ (循环)freely.
76. T_________________(因此), we must treasure the time.
77. I would always keep my distance from drinkers on social o____________(场合).
78. Mother always tells me not to __________ ___________ ____________(瞧不起)anyone, even if he is not well educated.
79. Every morning my grandfather spends 45 minutes doing physical exercises to _____________ __________(增强)his health.
80. The magician performed many magic tricks to ______________ the audience(娱乐观众).
71.in debt 72.out of curiosity 73.permission 74.connection 75.circulating
76.Therefore 77.occasions 78.look down on/upon 79.build up 80.entertain