The following are links to various online dictionaries:
· The free dictionary
http://www.thefreedictionary.com/
· Cambridge
http://dictionary.cambridge.org/dictionary/british/happiness?q=happiness
· Oxford
http://oxforddictionaries.com/definition/english/wonderful?q=wonderful
· Longman
http://www.ldoceonline.com/dictionary/miserable
· Merriam-Webster dictionary
http://www.merriam-webster.com/
· Etymological dictionary
http://www.etymonline.com/index.php?term=blind
· English phrasal verbs
http://www.usingenglish.com/reference/phrasal-verbs/b-list.html
· Urban dictionary
http://www.urbandictionary.com/daily.php
Links to websites to practise American English
· Daily ESL: you can listen, read the text, do follow-up exercises
http://www.dailyesl.com/index.htm
· More advanced language
http://www.ezslang.com/
· Advanced listening activities including reading, answering questions and text completion.
http://www.agendaweb.org/listening/advanced.html