急求一篇关于交通工具的利弊的英语作文（考试用的，100至120字，最后加上自己的观点）

With the development of science and technology , more and more students have their own mobile phones . Of course ,it is convient for them to keep in touch with others but on the other hand some students use them to cheat in the exams . They use them to send answers , which will certainly affect their study . Because they have formed the habit of cheating and become lazier and lazier . At the same time they have cheated their parents and waste their limited time , which should have been spent on their study .So I think mobile phones are not very good for students. At least we should make proper use of them . Only in that way can it be a useful tool.