阅读下面短文，在空白处填入一个适当的词，或填入括号中所给单词的正确形式。

    The Internet is an amazing information resource. Students, teachers, and researchers use it as ____searching tool. Journalists use it ____(find) information for stories. Doctors use it to learn more about unfamiliar diseases and the ____(late) medical development. When we are talking about it , it ____ (use) by ordinary people for shopping, banking, bill-paying, and communicating with family and friends. It has the magical power to connect one with people from ____ countries and cultures. However, ____ the Internet has many advantages , there are also certain fears and concerns connected with it. One concern relates to a lack of control over ____appears on the Internet. On television and radio there are restrictions (限制）on what kinds of programs can  be broadcast, ____ on the Internet it is not the case. Parents cannot determine what is suitable ____ their children to see because the ____ (appear) of any information is not under their control.