阅读短文，按要求做题。

Do you know about the U.K. ? London is the capital city. Its flag is red, white and blue. They speak English. Big Ben is very famous. Kings and queens live in palaces. I have an uncle. He lives in London. He says, " London is clean and beautiful." He is a teacher. He works from Monday to Friday. On Saturdays and Sundays（因为）I want to see Buckingham Palace.