A1 - 3
A2-2
A3 - to be known for, to be assotiated with, to be washed by, to consist of.
A4-2
B1-Hyde Park
B2-The United Kingdom, Albion,Greater London,Snowdonia
C1 - These places are the London Eye, Big Ben, Westminster Abbey,the Houses of Parliament, Buckingham Palace, St Paul’s Cathedral and the Tower of London.