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Ответ:

1 millions

2 visitors

3 fortress

4 According

5 leave

6 three

# 9.

1) С артиклем the:  

the Tower of London

the Thames

the Russian Federation

the Houses of Parliament

the Kremlin

the Volga

the USA

the Bolshoi Theatre

2) без артикля the:

England, Westminster Abbey, Spain, Moscow, Palace Square, Downing Street, Big Ben, Trafalgar Square, Tverskaya Street, St. Basil's Cathedral, Italy, Oxford Street.