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 If you (look) for the most important book in your country's history,(come) here to the british library . (get) off the tube at St.Pancras - King's Cross station.after you (get) on the  street, you (be) about 300m away for the Librery.

 If you look for the most important book in your country's history,come here to the British library . Get off the tube at St.Pancras - King's Cross station. After you get on the  street, you will be about 300m away for the Library.