题目内容：
2[填空题,20分] The euro is 1 a tool to 2 political solidarity. This political motivation began when the idea of the European union and a 3 currency was first conceived. while it also has the economic effect of 4 the economies of participating countries , it ultimately does much more for the European union. Economically, the 5 advantages include: 6 of exchange-rate fluctuations, 7 transparency, lower transaction 8 , increased trade across borders, increased cross-border employment simplified billing, financial market 9 ,macro-economic stability, lower interest 10 , and structural reform for European economies.
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