书面表达。
请你以英语课代表的身份，用口头英语通知全班学生，告诉大家下周一上午八点半全班同学到阶梯教室(the lecture room)上英语课，由陈老师上公开课(an open English class)，全校英语教师也都要来听课。要求大家做到以下几点：
1．打扫阶梯教室,保持整洁。
2．做好课前各项准备工作。
3．八点半前到阶梯教室，不要迟到。
4．课堂上认真听讲。
5．先举手后发言，对老师要有礼貌。
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(One possible version)
Hello, everyone! I've got something important to tell you. An open English class will be held in the lecture
room next Monday. It will be given by Mr Chen. All the other English teachers will be there for it. Every one of
our class must do the following things well:
Clean the lecture room and keep it in good order. Get everything ready before class. Don't be late and better
be there before 8:30 a.m. Listen to the teacher carefully. Put up your hands before you want to speak. Be polite
to all the teachers.