求老师解答：改写句子.1.Th 改写句子. 1.They did not go to the Summer Palace

1. Having a lot of work to do, they did not go to the Summer Palace.
2. Hearing a cry for help, he rushed out.
3. Recognizing the man who had been his classmate ten years be- fore, he was happy.
4. Talking and laughing, the students went home from school.
5. Being very old, he had to give up his teaching.
6. Being an engineer, he knew exactly what to do.
7. Having finished their homework, the children went out to play.
8. Having been given such a good chance, how could she let it slip away?
9. Passing by the house, he saw a girl playing the piano.
10. Not having found the wallet, he had to borrow some money from her.