短文改错
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。
Mary is a 16-year-old high school student, who devoted herself to her lessons every day. Last Saturday, as usual, she went to several class. In the evening, she continued to study until deeply into night. She was too sleepy and tired that she couldn’t work effectively. On the Sunday morning, she was about to do her lessons while her father came up and advised her to take a break. Soon they came up a good idea. We decided to go cycling in the countryside. Mary had great fun, competing and chatting with her father, and felt relaxing in the open air. On Monday, Mary was energetic but active in class.