1) What river runs through Washington Dc?
2) What is the official language of Washington Dc?
3) What is the capital of the United States?
4) What is the official currency of the United States?
5) How many states are part of the United States?
6) Who is the current mayor of Washington DC?
7) How many neighborhoods are in Washington DC?
8) What year was the Washington Monument completed?
9) What is the name of the DC subway system?
10) What is the name of the largest park in DC?