С: complete the sentences with the definite article the if necessary. 1 when built? 2 what museum famous for? 3 where of parliament situated? 4 theatre is one the most famous theatres of the world,isn't it?

1  When was the Tower of London built?
2  What is the British Museum famous for?
3  Where are the Houses of Parliament situated?
4 The Bolshoi Theatre is one the most famous theatres of the world, isn't it?