Correct the subject – verb agreement errors in the following sentences, if needed
1.The variety of Internet newsgroups provide something for everyone.
2. The length of a typical online session are twenty – five minutes.
3. Those who “surf” the Web is growing in number every day
4. Usually, the Internet “addict”, together with family or friends, solve the problem in a relatively short time
5. Many people accessing the Internet use it for sending e-mail and playing