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。
    The Internet is an amazing information resource. Students, teachers, and researchers use it as ____ investigative tool. Journalists use it to find information for stories. Doctors use it to learn more about unfamiliar diseases and the____ (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____ countries and cultures. However, ____ there are many positive developments____ (associate) with the Internet, there are also certain fears and concerns.  ____ concern relates to a lack of control over____ 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____ (restrict) on what kinds of programs can ____ (broadcast) and at what times of the day. With the Internet, parents cannot check a published guide to determine what is suitable____ their children to see.