根据句子内容和汉语提示，用所给词的正确形式填空（一空一词，每题1.5分，共15分,请把正确的词写在答卷纸上）
71. 小题1:John Snow wanted to face the _____________( 挑战 ) and solve this problem.
72. 小题2:He found that it came from the river __________( 污染 )by the dirty water from London.
73. 小题3:The southern part of Ireland was unwilling and _________(脱离) away to form its own government.
74. 小题4:For convenience, it is divided _________( 大约 )into three zones.
75. 小题5:At first my new ________(环境) were difficult to tolerate.
76. 小题6:These carriages float above the ground and by bending or _________(按，压) down in your seat.
77. 小题7:We are __________(高兴的) you are coming to work with us.
78. 小题8:__________(与此同时) you have to prepare the next question depending on what the person says.
79. 小题9:The functions of your skin are also very __________(复杂的).
80. 小题10:You can get burned by a _________(多样) of things: hot liquids, steam, fire, radiation ect.