1.recently,there has been a fierce debate on whether middle school students should be allowed to take cellphones with them . some students are in favor of it.they hold the opinion that a cellphone is more convenient when they want to get in touch with their parents and friends.what's more ,cellphones give them a lot of pleasure ,from which they can relax themselves. however ,some are against it .they argue that its advantadges far overweight its disadvantadges .first,it is harmful to others if one is using it in class.second,it costs too much and it may have bad influence on our study .in addition ,they think it not safe to take such an expensive thing to school . （以下为个人观点，可根据需要决定是否添加） in my opinion,it's no use taking cellphones to shool.we have public phones in our school.we can live the same without cellphones,or maybe even better.
2.it has been widely recognized that mobile phone can do a lot of harm to people's health and many evidence can be named to prove this. for one thing, not only can they harm your eyes,making you be short in sight,but also scientists have proved that they can also affect your brian as well. for another,it is a waste of time to usse mobile phone too much,which will makes you addicted. moreover, mobile phones can also spread some false information to cheat you. last but not least,it can be a waste of energy and money. so ,only when you face this problom carefully,can you avoid its bad effcets.