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仅限一词；
2）只允许修改10处，多者(从第11处起)不计分。
Notice
A grand event celebrating the 110th anniversaries of the founding of our school will be holding on September 12th, 2017. Former schoolmates from home and abroad are warm welcome to attend them. The celebration is planned to start at 9:00 am and end at 5:00 pm in the school gym. After enjoyed the wonderful performances presented by teachers and students, you are to attend speeches and teaching seminars be held in the teaching building.
Please be in time and do remember not to walk about during the celebration. Taking photos or asking questions are allowed. Anyone that wants to make a speech should get well prepared ahead of the time.
Students' Union
June 15th, 2017
的离心率为
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的直线与椭圆C相交于
、
两点．若
，则
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