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。
    High school is regarded as best time of my life. Beside classes and homework, there's something more that I especial treasure. To leave school without regrets, I'll make the best of my limiting time to go over the lessons I've learned from. At the same time, I'd like to show my thanks to all the teacher who have given me so many help in the past three years. For the purpose of improving me, I'll ask my classmates for some advice, that may be of great value to me. Last but not least, doing some good deeds for my classmates are also my plan. With these things being done, I will have no regrets in my high school life.

淮安市2011年底总人口数约达4799900人，土地面积约10072平方千米，2012年1～5月份完成财政收入约达18610000000元，城市人均公共绿地面积达到11平方米．根据以上信息，完成下列填空：

①把总人口数改写成用“万”作单位的数是____万人．

②淮安市土地面积为____公顷．

③财政收入省略“亿”后面的尾数约____亿元．

距离南极洲最近的大洲是（　　）

小明同学在跑100m时，他用了10s．求他的平均速度？

用正方形和正方形组合能够铺满地面，每个顶点周围有m个正三角形和n个正方形，则m+n=____ ．