B. The Tower of London is a very old building in London. It is nine hundred years old. The Tower of London stands on the Thames. In the early days of the history of England the English kings lived in the Tower. Then it was a prison where many people died, black ravens had much food near the walls of the Tower in those years. The black ravens live in the gardens of the Tower now. The English people like them very much. A man looks after the ravens and gives them meat in the morning and in the evening. Now the Tower of London is a museum and many people from other countries come to see it. They see the dark stone halls with small windows and thick doors. The walls of the Tower are five metres thick. In the museum they can see many old guns.