Here I have some advices. To students, you'd better to choose the activities which interest you and suit you; to schools, they should organize more activities for students, leave students time for activities by giving them more homework.

　　Dear friends, please actively take part in after­class activities, what will not only make your school life colorfully, but also improve your learning.

　　答案：

　　Nowadays, after­class activities are becoming more and more popular in high schools. In our school, there are various kinds of activities and we

　　them very much. Playing football is my favorite, which

　　me lots of good, such as building

　　my body and keeping me healthy. ， it also frees me from the heavy work of study.

　　Here I have some . To students, you'd better to choose the activities which interest you and suit you; to schools, they should organize more activities for students,

　　students time for activities by giving them

　　homework.

　　Dear friends, please actively take part in after­class activities,

　　will not only make your school life ， but also improve your learning.

　　解析：

　　第一处：enjoyed→enjoy　本篇文章是一篇说明文，介绍课外活动，通篇使用一般现在时。

　　第二处：do→does　定语从句的引导词which代替先行词Playing football，谓语动词用第三人称单数形式。

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