1 . 选出下列句子的结构

1. Studying hard isn’t always fun.
2. This afternoon, we had our chemistry class in the science lab.
3. There are a lot of extra-curricular activities at senior high.
4. We work at a soup kitchen.
5. I had to choose extra-curricular activities, too.
6. I found most of my classmates and teachers friendly and helpful.
7. He even told us a funny story.
8. But I won’t quit.