English for International Tourism

Info on comparative and superlative adjectives:

http://www.eflnet.com/tutorials/adjcompsup.php

http://www.englishclub.com/grammar/adjectives-comparative_1.htm

http://www.dailywritingtips.com/comparative-forms-of-adjectives/

http://learnenglishteens.britishcouncil.org/grammar-vocabulary/grammar-snacks/comparative-and-superlative-adjectives

And exercises:

http://www.eflnet.com/grammar/compsupadj1.php

http://www.ego4u.com/en/cram-up/grammar/adjectives-adverbs/adjectives/exercises

http://www.englishexercises.org/makeagame/viewgame.asp?id=3565

http://www.englisch-hilfen.de/en/exercises/adjectives_adverbs/adjectives_comparison_sentences2.htm

http://www.clafoti.com/imagenes10/compa_1.htm

http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-9451.php

http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/regcom1.htm

http://www.saberingles.com.ar/curso/lesson12/05.html

http://www.softschools.com/quizzes/grammar/adjectives/quiz328.html