51. Life in the forest is a constant battle for survival. A. flight B. struggle C. option D. guess 52. Ralph Bunche won a Nobel Prize in 1950 for his peace making efforts as a United Nations diplomat. A. requests B. trips C. offers D. attempts 53. Many statistics related to the economy are published quarterly. A. every month B. twice a year C. every three months D. once a year 54. As she is new to the job, I would like to ask you to keep an eye on her for the time being. A. look at B. consider C. check D. observe 55. He kept saying he didn‟t do it, but in the end he said he had done it. A. at the end B. finally C. at last D. by the end