小题1:D
小题1:B
小题1:C
小题1:B
小题1:A
小题1:根据Some students’ mobile phones are stolen, 可知选D。
小题1:根据I think there are three causes for these. 及下文描述可知选B。
小题1:根据Secondly, some students want to do everything well. They want to be the winners in exams, and they also want to be the winners in fightings. 可知选C。
小题1:根据the campus guards(保安)do not carry on their duties well.保安没有很好的履行他们的职责，结合下文the traffic in the busy hour 在忙碌的交通时刻，可知选B为最佳答案。
小题1:根据In order to have a secure campus,为了有一个安全的校园，及下文描述可知是讲如何保护学生，故选A。