When you get an unexpectedly expensive bill, you can take a copy of it and burn the copy!!!
I recommend this to refresh yourself.
NOTE: You must not burn the original, you know.
I'm a Japanese international student studying in Canada. I am trying to improve my writing skills in English by creating this blog, so if you have time, please correct my English. It'll greatly help my writing. Oh, you can write your comments without correcting my English, but please don't use the space for advertising... ( By the way, my older blog and the Japanese one are here too. http://www.sasakukublog.blogspot.com and http://www.sakunikki2008.blogspot.com ) Thank you.