题目内容：

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。请将答案写在答题卡上，写在本试卷上无效。

The Internet is an amazing information resource. Students, teachers, and researchers use it as __1._  investigative tool. Journalists use it to find information for stories. Doctors use it to learn more about unfamiliar diseases and the 2.   _ (late) medical development. Ordinary people use it for shopping, banking, bill-paying, and communicating with family and friends. People all over the world use it to connect with individuals from 3.    countries and cultures. However, __4.____there are many positive developments  __5.__ (associate) with the Internet, there are also certain fears and concerns.  __6.__  concern relates to a lack of control over__7.__  appears on the Internet. With television and radio there are editors to check the accuracy or appropriateness of the content of programs, and with television there are 8.    (restrict) on what kinds of programs can  __9.__(broadcast) and at what times of the day. With the Internet, parents cannot check a published guide to determine what is suitable _10.___ their children to see.