3. 每一个小朋友都想成为一名好学生，让我们帮这位同学完成他的好学生感言吧！

Hello. I'm a good student.
I can put...
I can help clean our classroom.
I can...
I follow rules at school.
Ⅰ...

参考完整感言：
Hello. I'm a good student.
I can put all my school things into my schoolbag in order.
I can help clean our classroom.
I can turn off the lights when no one is in the room, and I can join the national flag raising ceremony every Monday.
I follow rules at school.
I will keep quiet in the library, and I never run in the hallway.

本题是三年级英语口语输出练习，需要结合图中给出的书包、关灯、升国旗、禁止喧哗、禁止奔跑的校园相关提示元素，用符合三年级词汇量的简单基础英语短句补全感言，内容贴合“好学生在校主动做好事、遵守校规”的主题即可。