请高手帮忙修改一下英语作文！急啊！

Though its summer holiday，I still have little time to do some things out of study.Besides to do the endless homework,I have to play the piano for at least one hour every

day.When I try to tell my mother that I want to go camping with my

friends for a rest，she gets very angry . I know that it is very important for

our students to study hard. I also konw that the more knowledge I grasp，the more

powerful I will be.However, the meaning of knowledge is very wide,it not only konwledge on the book ,but also knowledge out of book.