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151. You must guarantee against the _____ of similar incidents. A. occasion B. happening C. commencement D. occurrence 152. The government has yet to ____ suitable means to compensate those evicted from building sites. A. work out B. work up C. draw out D. draw up 153. Earnings have held up well _______ some very negative developments, including a big drop in the dollars value. A. instead of B. in the face of C. in excess of D. in consequence of 154. Drug was never _____ to sufficiently severe tests. A. submitted B. imposed C. exposed D. subjected 155. Stability is _____ for the world economy. A. vital B. fatal C. mortal D. neutral 答案： 151. D occasion 场合, 时机, 机会 happening 事件, 意外发生的事 commencement 开始, 毕业典礼 occurrence 发生, 出现, 事件, 发生的事情 字义辨析：happen, occur, take place, chance | 
