根据课文内容完成下列句子。

1. My project is about _________.

2. America is also called the _________.

3. People speak ________ in America.

4. Washington D. C. is the _________ of the USA.

5. New York is in the __________ of America.

6. San Francisco is in the __________of America.

7. Washington D. C. is in the _________of America.