阅读下面材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。

    According to a recent survey, violence did exist in schools. Students showed their fear and parents and teachers also expressed their great concern about it. Experts hope the whole ____ (social) pay more attention to the mental health of adolescents(青少年).

    Nowadays, school violence is a hot issue. I think this is a phenomenon, ____  calls for our great concern. We should try every effort ____ (prevent) violence happening at school for more and more students would drop out of school ____ their personal safety could not ____ (guarantee). In fact, violence can be learned. Children learn violent behavior from adults or from ____ they see on television or on ____ Internet.

    If I meet with school violence, I will not answer violence ____ violence, for it will result in ____ (much) fighting. I will tell my teachers or parents about it. I think they will help me deal with it well and they will protect me from the bad guys.

    All in all, every student should behave ____ (he) and keep away from violence.