25+30-40, 16, 15, Do you know what is the biggest country in the world?, China, Russia, What country is the dirtiest in the world?, Pakistan, Italy, What country is the cleanest in the world?, Denmark, Estonia, What is the smallest country in the world?, Vatican City, Nauru, San Marino, Monaco, Spell the name of the city on china, Beijjing, Beijing, Bejining, Belijing, Kilometres to metres is, 100, 1000, 10, 10000

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