Написать письмо на на тему "плюсы и минусы интернета" заранее .

Просто напишу плюсы и минусы, сами вставите куда вам надо.
+
Internet has many advantages. With the help of it studying is much more interesting and people can get their education at home. Also you can talk to your family and friends all the time when you need it. Moreover in the internet people can relax and just watch their favourite films.
-
You can become addicted to the internet. It is a waste of time because many people instead of doing necessary thing do nothing by surfing the net. Also in the internet there are bad people who can tell you to do stupid things.