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41.Professor Smith seldom _______ the class on time. A.dismisses B.nervous C.misleads D.regrets 42.Mr. Wang _______ his wife and children when he went to the United States. A.prescribed B.delayed C.decreased D.deserted 43.He _______ a lot of time in trying to develop the education system in this area. A. involved B.investigated C.invested D.interfered 44.They spent many years _______ for oil in this small island. A.exploring B.exploding C.exposing D.exploiting 45.We cant _______ the fact that we are still a developing country. A. ignore B.neglect C.imagine D.impress 46.Can you _______ the man who robbed you of your watch? A. illustrate B.exhibit C.damage D.identify 47.Many children in developing countries can not go to school,because of _______ A.property B.sword C.trace | 
