增加：在缺词处加一个漏词符号（∧），并在其下面写出的加的词。
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。
Online classes offer a solution on ensuring students' academic progress. They broke the space limitation but protect us from the risk of infection. But the negative aspects are also apparent. Lack face-to-face communication, students poor at self-discipline are easy to be absent-minded than before. Besides, being exposed to the Internet environment have a bad effect on students' health.
To cope with the problems, I set a schedule that I strictly stick to it. When in class, I concentrate on which teachers say and think actively in order not fall behind. During class breaks, I do indoor exercise and help with houseworks to keep fit.
