Mobile Phones are popular all around the world . In r___ years there has been a quick rise in the mobile phones . Some people can now no longer imagine ( 想象 ) life w____ their mobile phones. However , mobile phone use among children has become a p___ for schools now . Some middle schools in China have banned (取缔) students from c____ phones during school hours . Some children have received mobile phones as Christmas gifts . Teachers say mobile phone use is a distration（分心）to students during school hours and it also g__ teachers so much trouble in their classroom .Teachers also said that sometimes students might use phone messages (信息) to cheat during exams. She said some schools have t__ to ban mobile phones . Some parents felt u___ because they couldn’t get in touch with their children. Many students said students shouldn’t have mobile phones when at school but if there was a good reason , they could leave their phones at the school office. They are e____ lost and are a distraction from students studies. Many people say that they understand w_ parents would want their children to have phone but they think schools should let students k____ when they can use their mobile phones