2. 外语
  3. Pollution has become a serious problem in almost all the big cities of the world. City people are becoming more and more worried

Pollution has become a serious problem in almost all the big cities of the world. City people are becoming more and more worried

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问题     Pollution has become a serious problem in almost all the big cities of the world. City people are becoming more and more worried about how they can【11】pollution. They are also concerned about whether the government is doing enough to【12】the environment. However, people in Ireland don’t have these worries. They are sure that they have found the【13】the problem. They use windmills. These windmills can create power without【14】pollution. This method is so successful that other countries are【15】doing the same. Why not? What works for Ireland can work for any other country.
  
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答案thinking of
解析 这里是现在分词与are构成现在进行时，意为"正在考虑…"。
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