阅读对话，回答问题。 A: Hello. I'm from a big country. Our capital is Ottawa. The Rocky Mountains are in our country. We speak English and French. B: Hi! Look at the flag of our country. It's red. There are five stars on the flag. They are yellow. C: The flag of our country has fifty stars. They are white. Canada is north of our country. D: In our country, we speak English. Our country is west of China. We have a king or a queen. They live in Buckingham Palace. 1. A's country is ______________. 2. B is from ______________. 3. The 2012 Olympic Games will be held in ______________'s country. ______________ is the capital city. 4. Obama is ______________'s country's president. He lives in the ______________ ______________.