https://www.flo-joe.co.uk/fce/students/writing/makeover/index.htm
http://learnenglishteens.britishcouncil.org/skills/writing-skills-practice
http://www.goodletterwriting.com/how-to-write-a-letter.html
http://www.eoilangreo.net/guia_expresion/Ingles/INDICEINGLES.htm
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