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  Date:Nov 10 ,20xx
  To: visa section of Canadian Embassy
  Dear visa officer:
  I would like to invite my mother Ms. (Passport No.) and father Mr. (Passport No .G)to Canada to stay with me for two weeks since Feb 7,20xx.
  I have been studying in Canada for over  years and I miss them so much.I do hope that they can pay me a visit.
  During their stay here,they will also get an opportunity to experience the culture and sceneries of Canada.They will enjoy the nice city I live in.All the costs of this trip will be covered by themselves.Please kindly accept the visa applications of my parents.I’m expecting to see them in Canada.
  Best regards,