书面表达假设你是李华.昨天,你所在的学校组织学生进行了一次地震逃生演习,请你根据下表的内容给你的英国笔友Tom写一封信,

Dear Tom,
I'm writing to tell you that an earthquake drill was held in our school yesterday. After we had two classes, our teacher gave us some instructions on what to do during the drill.
When the alarm rang, all of us students hid ourselves in safer places. As soon as the alarm ended, we followed the teacher and ran downstairs one by one. We finally got together at the playground.
Through the drill, we have learned how to escape in an emergency. I think it is important for us to remain calm and know what to do.
Yours
Li Hua