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，每处错误仅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
误及其修改均限一词。
2.只允许修改10处，多者（从第11处起）不计分。
Learn English is important. English, that is widely used all over the world, is often used in the international meetings. Most business letters are writing in English. With the help of English we can learn modern science and technology from developing countries. We can also introduce our achievements and products to other country. Because its importance, English is a required subject in high schools and colleges. Now many people are working hardly at English. It's very important to learn English well. If we master the English, we can serve our country better. But I suggest that every student learns it well.