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what would you advise me to visit?
is museum entrance fee high in ST(Санкт-Петербурге)?
are there any discount for students?
(заранее огромное спасибо!)

ST is very beautiful city! You can visit it,you will not regret. Maybe if you want to go famespeciallyous museum, it will be exepencive. I think there is discount for students, especially for students of other cities. Надеюсь хорошо написала)