阅读下面材料，在空白处填入适当的内容(1个单词或括号内单词的正确形式)。
Just now，I entered the website “Topic for Today”. I feel________ (interest) in the report on middle school students’ using cell-phones on campus. In fact，more students now come to school________ cell-phones. My schoolmates have different opinions. Some think________  is convenient to get in touch with others with the cell-phone，________  also makes them feel safe  especially in time of trouble. Besides，it is nice to enjoy ________ (variety) functions of different cell-phones.
Others think differently. First，the cell-phone is not________  must in school，as there are some IC phones there，________ (make) it easy to call others. Second， many students often  play e-games and send________ (message) with their cell-phones，even in class， which will surely have bad effects on their study. What’s more， a large amount of time and money will________ (waste).In my opinion，the cell-phone is a  useful tool in our daily life. But it doesn’t mean we can use it________ (free) in school.