The good sentences in "The Biography of Pipilu" are as follows:

1. Pipilu also has a twin sister named Lu Xixi.

2. Pipilu and Lu Xixi went home from school and passed by the "Red Sofa Music City". Pipilu accidentally discovered "Shukebeta Airlines".

3. Beta sent Pipiru a gift in a balloon, which was an electric car.

4. Pipiru was unhappy. He thought he should be greeted with tanks.

5. Pipilu and Beta decided to establish "Pipiru Airlines".

6. Beta drove his newly invented peanut airplane to direct in the sky, while Pipiru drove a steamroller behind.

7. The road roller made the road surface smooth, and Beta drove a polishing machine to polish the road surface smooth and smooth.

8. Early the next morning, Pipilu went to school, and he saw new changes in the school. Pipilu discovered that the principal's surname was no longer Wei, but Zheng.

9. Teachers no longer take chalk during class. Principal Zheng gives each student a small bamboo board. During math class, the teacher takes the small bamboo board and writes questions one after another on the bamboo board. The answer is written on another bamboo board.

10. Pipilu felt that he would gradually get used to all the strange things that happened in the school. Pipilu thought it was interesting to be a teacher. He decided not to be a general when he grew up, but to become a teacher.

11. The winter vacation is here, and Pipiru decides to use this vacation to find Zheng Yuanjie.

12. Zheng Yuanjie decided to take Beta and Pipilu to travel along the Silk Road.

13. When everyone was at a loss, Beta shouted: "Yes." Everyone was surprised.

14. When Pipilu saw his mother’s eyes full of eager anticipation, he decided not to go to the circus, even though he wanted to see it very much. He knew that his mother would be happy with his decision.

15. Pipilu seemed to see vivid stories one after another, and he felt full of hope and confidence for the future. He believes that the future must be beautiful and can be changed through his own efforts.