单词拼写: 根据首字母或中文提示写出单词（每小题1分，满分10分）
71.The results of this research will be a_____________ to the treatment of lung cancer.
72.The cell phone w_______________ only 70 grams is convenient to use.. 
73.I tried to get through ,but there were too many people b            my way. 
74. I was going along the street looking for a place to park when the accident o_____.
75.Every year the company e__________ the workers and then decides their monthly pay.
76.During World War II, when London was bombed, many stations f_______ as bomb shelters. 
77. This meeting ____________(加快了) the pace of educational reforms.  
78. After his ________(获得) of the diploma, he volunteered to work in the Northeast of China. 
79. The river water is used by the local people after being          (净化)． 
80. Five years after the International standards for digital TV were established ,_______（消费者）could have access to more than 200 channels in the USA.