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1. I have never seen any exhibits of the British Museum.
2. She is very unhappy : her son has fallen ill and can't go to London.
3. My brother was reading a book about the Tower of London from 6 till 8 yesterday.
4. Mike visited Madame Tussaud's Museum many times.
5. While Mary was having a rest in her hotel room yesterday, we were watching the ceremony of Changing the Guard.
6. When did your sister travel to London?
She went there last week.
7. Look! Mary is taking the pictures of St . Paul's Cathedral.
8. Have you ever been to Harrods?
Yes, I have. It is the most expensive shop I have ever visited.