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EU has 23 official languages.
But the most common language must be English.
Nowadays Europeans speak and understand English much more, comparing with 30 years ago.
Now EU is composed of 27 sovereign member states: Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, and the United Kingdom.