题目内容
They kept on trying their best to develop their business, but in such _____ market competition, they had no idea if success would come along one day.
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As music plays an important role in our life, many music teachers and educators _______ taking up a musical instrument at a young age.
There is widespread concern that the rising unemployment may_______ a threat to social stability.
It is well known that China is a country with rich natural________and a very big population.
Some people believe that the earth can_______ enough food to support at least twice its present population.
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