There great changes in our city in the past 10 years.
The policeman told us the street when the traffic light was red.
— Joan has never been to Beijing. What about Jack? —
— I have no idea to tell her the bad news. — I think tomorrow is the best time.
Mr. Li will go to Guangzhou by air. His workmates are at the airport.
— What is the population of America? — I don’t know. But I know it’s than that of China.