3.Is Shanghai a newer city than Hong Kong?  

Tony: Daming, can you answer some questions for my homework, please? What's the population of Shanghai?
Daming: 13 million people, I think.
Tony: And is Hong Kong bigger than Shanghai?
Daming: Hong Kong has 7 million people, so Shanghai is bigger.
Tony: And is it hotter in Hong Kong?
Daming: Yes, it is hotter in Hong Kong.
Tony: And is Shanghai a newer city than HongKong?
Daming: Shanghai is seven hundred years old. It's an older city.