Ответ:
1. The population of the state of Washington is 7.2 million people.
2. Washington is known of its National Mall.
3. The world famous White House is located in Washington.
4. I\’ve never been to Washington yet.
5. People in Washington are friendly and nice to foreigners.
6. The plane is already next to Washington DC.
7. Life in Washington is not really cheap.
8. Olympic is the national park of Washington.
9. My friend advised me to visit Washington.
10. The beauty of Washington holds me in thrall.