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The best way of unblocking a site at school is by using an unblocker. You can get to any blocked site by using this method.
Other ways to access a site are to use sites that translate pages , for example Google Translate or Babelfish. Also try Google's cached copy of the site. Unfortunately, you can't to log in using these methods, so you're better off using an unblocker if you need to login.
Here are some unblockers you can use to unblock a site:
www.amcloaked.info
passandsurf.info
safefactor.info
prox-c.info
gurunet2.co.cc