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限制) 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.