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  During a trip to observe wild animals in Africa, I encountered the least brave animal on earth, the wildebeest(角马). I sat on a riverbank for three hours watching a group of thousands build (56)_____ the courage to drink water.  More than a million w

  During a trip to observe wild animals in Africa, I encountered the least brave animal on earth, the wildebeest(角马). I sat on a riverbank for three hours watching a group of thousands build (56)\_\_\