Good morning, everyone! Welcome to our school. Now you are students of a middle school. All the things here are new. The life here is a little different. I think you must know what you can do and what you can't do. It can help you study well and live happily. Here are some rules of our school. You have to come to school from Monday to Friday. You will learn some important subjects, such as Chinese, math, English and science. Classes begin at 8:00. You have four classes in the morning. You have lunch in the school dining hall. You can't eat in the classroom. Classes are over at 3:30 in the afternoon and then you can join your favorite clubs to have fun. You can't play balls or run in the classroom and hallways. You mustn't _ these rules. I really hope you will have a happy life here. Thank you. The speaker mainly  tells them   _  .
some important subjects some school rules clubs and school activities interesting school life