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Помогите вставить разделительный вопрос в предложения.английский(не так ли,не правда ли?)

Many people in Russia do not even know that there are several special occasions in the Russian celebretions calendar,________?
Easter is the most important Christian holiday in Russia,__________?

Many people in Russia do not even know that there are several special occasions in the Russian celebretions calendar, do they?
Easter is the most important Christian holiday in Russia, isn’t it?