根据所给提示，完成句型转换。每空一词，含缩略词。
1. They have cleaned the classroom. (改为一般疑问句并作肯定回答)
______ they cleaned the classroom? Yes, they ______.
2. I have seen this film. (变否定句)
I ______ ______ this film.
3. He has got a good education recently. (同义句)
He has got a good education in ______ ______.
4. His father left Chongqing in 2004. (同义句)
His father has ______ ______ from Chongqing since 2004.
5. The population of China is over 1.3 billion. (对划线部分提问)
______ ______ the population of China?