题目内容：

短文改错

Dear Mark,

I'm very glad you are so interesting in our school. Recent our school is launching an activity to call for thrift(节俭) and go against waste. Every student was required to save paper, water, electricity or food. All waste paper must be collected and sold to help poor student. Water must be made full use and now you cannot find any tap what is left running without students around. And each student should get into a great habit of turn off the light on time. What's more, all of us are called on not to use their pocket money to buy some things unnecessary and some students even use their saved money to help the students in the need.

Yours,

Li Hua