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   Fifteen wild Asian elephants that left their home in Xishuangbanna last year are continuing to march north, according to China Daily on June 4th, 2021, which attracts much attention ______ the public. The endangered Asian elephant enjoys Class-A ______ in China, the same level as the giant panda does. The number of Asian elephants in China has ______ from 170 in the 1970s to about 300 nowadays. Why are they on the ______? Maybe there are two main reasons. First, the growing population of elephants need more space and food to live. Second, some areas where they live often face huge pressure to develop the local economy（经济）, making them move to other areas. ______ the government is taking action to lead them gradually back to their home.