http://www.grammar.cl/Games.htm
http://www.agendaweb.org/
http://iteslj.org/v/ei/body.html
http://english-zone.com/index.php

interactive lessons

http://www.englishmedialab.com/Quizzes/preintermediate/comparatives%20superlatives.htm

listening

you can practice the listening lesson
http://www.esl-galaxy.com/board.htm

english online activities

http://www.usingenglish.com/handouts/

....and more

http://aliscot.com/bigdog/
http://www.english-the-easy-way.com/
http://www.englisch-hilfen.de/en/exercises_list/alle_grammar.htm
http://a4esl.org/
http://www.woodward.cl/actividades.htm
http://www.english-online.org.uk/games/gamezone2.htm
http://www.ego4u.com/en/cram-up/grammar

more activities

hi, please go to
http://www.curso-ingles.com/ejercicios-test-ingles/test.php
there you will chat in english