Nowadays, more and more students have their own mobile phones.

      A mobile phone is very useful for us. It offers a lot of convenience. If we have a mobile phone, we

can find our friends easily. We can send short messages to our friends. And sending messages is getting

more and more popular now. If you have a mobile phone, other students may think you're popular.

      But it also brings some trouble. Some students don't mind their study at all, so they send messages

to their friends in class.  Some  of  them  may show off  their new expensive mobile phones to others. I

think it's pretty terrible.

      I think we can have mobile phones.  And we should study hard as well.  A mobile phone is useful

and study is important as well.

（答案不唯一。）