More and more students bring mobile phones to school now.I suppose it ____ (be) bad for students because I can't find any advantages in ____ (bring) them to school.Some students use mobile phones to send messages ____ others in class.Some use mobile phones to play games and others even take ____(photo) of students and teachers and post them online without _____(ask) permission.All these habits seem ____(terribly).Of course,mobile phones do bring convenience to students.They can keep in touch with their parents and friends easily ____ I hope schools can set some rules _____ students and make them use mobile phones in a right way.If so,mobile phones will become ____ (use) to students and students can listen _____(careful) in class and do well in school.