某公司2月份的利润为160万元，4月份的利润250万元，则平均每月的增长率为____ ．

此题要求改正所给短文中的错误。短文中有10处错误，每句中最多有两处。错误涉及一个单词的增加，删除或修改。

增加：在缺词处加一个漏字符号（ ∧  ），并在其下面写出该加的词。

删除：把多于的词用斜线（  \  ）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：

1）. 每处错误及其修改均仅限一词。

2）. 只允许修改10处，多者（ 从第11处起）不计分。

Jim,

    I am pleased to hear from you and I am written to tell you some changes in my school.

    You are right. Great changes have been taken place in my school. It is no longer that it used to be three years ago, when there were only one teaching building and a playground. I am happy to tell you two new building have been built and are in use. One of them is a new classroom building, in it there are rooms for music, arts and computer teaching. The other is a library, where there are all kinds of books, newspapers and magazines. Therefore, my school is well equipped about sports facilities and musical instruments. The number of students has also grown from 1,500 to 2,500. What's more, we had planted a lot of trees and flowers in and around the school.

I believe my school become better and better, and I hope you will visit my school again.

Yours,

Li Hua

—In fact, last month's lecture is a_________. Since then, he's changed a lot.