08. Intermediate Lessons Online

http://www.esolcourses.com/content/topicsmenu/intermediate.html

07.Synonyms and Antonyms

http://www.englishmaven.org/Pages/Synonyms%20and%20Antonyms.htm

Dvolver Movie

06. Activities, exercises and tests

http://www.world-english.org/

05. Mixed level activities

http://www.englishforum.com/cgi-bin/00/interact.pl?01

http://www.englishforum.com/cgi-bin/00/interact.pl?02

http://www.englishforum.com/cgi-bin/00/interact.pl?03

http://www.englishforum.com/cgi-bin/00/interact.pl?04

04. Cambridge ESOL Exercises

http://www.ihbristol.com/free-english-exercises/esol

03. Easily confused words

Both, either, neither, nor, so
http://www.ego4u.com/en/cram-up/vocabulary/both-either-neither-nor
Since and For
http://www.ego4u.com/en/cram-up/vocabulary/since-for
Some - Any
http://www.ego4u.com/en/cram-up/vocabulary/some-any
Little and Few
http://www.ego4u.com/en/cram-up/vocabulary/little-few
Much and Many
http://www.ego4u.com/en/cram-up/vocabulary/much-many
Who and Which
http://www.ego4u.com/en/cram-up/vocabulary/who-which
Must not and Need not
http://www.ego4u.com/en/cram-up/vocabulary/must-need-not
Weather and whether
http://www.ego4u.com/en/cram-up/vocabulary/confusing/weather-whether

02. Activities by level

http://wwwedu.ge.ch/cptic/prospective/projets/anglais/exercises/welcome.html

Grammar Activity 01

http://www.englisch-hilfen.de/en/exercises/if_clauses/mix2.htm