假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，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：把缺词处加一个漏字符号（∧），并在其下面写出该加的词。
删除：把多余的词用斜线（/）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。
I am glad to hear of you again. You want to know that everything is going in our school. In shortly, all has been improving since the school had began to carry on new policies. In the past, teachers always keep on explaining the points in class. Our students just listened and took note. But now we often discuss and try to solve the problems raising by the teachers or ourselves. Before class, we enjoy different kinds of activities instead of doing endless homework. For example, we can read what we are interested in. We can go to the library or surf Internet for various kinds of information. We are now masters of study, and we are happy.of 变成from
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(答案→)of 变成from
解析：文章是一封信，介绍学校开始实施新的政策以来，发生的变化，一切都在改善。
【小题1】很高兴又收到你的来信。Hear of 是“听说”，变成from，hear from收到某人来信
【小题2】你想知道我们学校情况怎样。用how引导宾语从句
【小题3】词组：in short简而言之
【小题4】自从我们学校开始实施新的政策，一切都在改善。Since后面用一般过去时：去掉had
【小题5】过去老师反复解释语言点。时间是In the past, 用一般过去式：keep 改成 kept
【小题6】我们学生只是听和记笔记。这里用We做students的同位语
【小题7】 note“笔记”是可数名词，take notes记笔记
【小题8】现在我们经常讨论，解释老师或我们自己提出的问题。 修饰problem用过去分词raised
【小题9】下课后，我们享受不同的活动，不是做大量的作业。Before改成 After
【小题10】上网“ surf the internet”