21.  And the computer viruses spread even faster through emails, causing lots of computer problems.

22.  The Internet has become more and more common and promised to change our lives dramatically beyond emails and online shopping.

23.  Imagine you use your school's email service to send out hundreds of invitations, and this slows down the school's service.

24.  Or our email box is bombarded with junk mail, which almost drives us crazy.

25.  We could easily to contact our family or friends through email or IM software like MSN; we also could find every information we want by the search engine like Google.

26.  For example, email bears a resemblance to paper mails but it is more fast and convenient.

27.  You may find that the reference materials you get from the Internet is inaccurate and misleading or your email box is full of junk mails just because you carelessly leak your personal information when searching the Internet.

28.  People can use it to get the news, chat with each other and send emails to everyone.

29.  When we want to send an email to someone who is far away, we can use a local Internet service provider.

30.  After typing the address and sending the email, then the service providers will send it to an Internet "backbone provider" to route it along its away.