Choose the best option (A, B, C or D) that fits the blank in the following passage
VII. Choose the best option (A, B, C or D) that fits the blank in the following passage. (2.0 points)
Water is one of our most precious resources; put it simply, without water there would be no life. Unfortunately, many of us seem to have (51)__________ this fact, and as a result the world is (52)__________ the danger of running (53)__________ water. The actual (54)__________ of water on earth has changed little since the time of dinosaurs. The problem has been (55)__________ by people's misuse of our water supply. This not only means that we have polluted our rivers and seas, but also that we are (56)__________ a great deal of this precious resource. Unfortunately the destruction of the rain forests has (57)__________ this problem worse since much of the rain that falls is lost because it runs off into the sea. The population of the earth is increasing daily, so it is vital that we (58)__________ a solution to this problem before it is too late. The first step is to educate people, especially by reminding them of the (59)__________ of water. For most of us it is available whenever we require it, whether to bathe in or to drink, so we seldom bother to think about it. People then need to be thought how to reuse bath or shower for household cleaning. Whatever methods we decide to use, we must comprehend the worth of water and (60)__________ we can conserve it.
51. A. looked over B. omitted C. forgotten D. missed
52. A. facing B. witnessing C. viewing D. noticing
53. A. out of B. into C. off D. away with
54. A. sum B. total C. number D. amount
55. A. brought out B. caused C. done D. happened
56. A. exploiting B. wasting C. spending D. throwing
57. A. caused B. done C. created D. made
58. A. recover B. work C. find D. come up
59. A. value B. cost C. price D. wealth
60. A. what B. how C. where D. when