Elementary podcasts
http://learnenglish.britishcouncil.org/en/elementary-podcasts
Professional podcasts
http://learnenglish.britishcouncil.org/en/professionals-podcasts
Build your speaking skills
http://esol.britishcouncil.org/content/learners/skills/speaking-0
Pronunciation activities
http://esol.britishcouncil.org/content/learners/skills/pronunciation
http://www.bbc.co.uk/worldservice/learningenglish/grammar/pron/
Cohesion:
Linking words
http://library.bcu.ac.uk/learner/writingguides/1.33.htm
Discourse markers 1
http://www2.warwick.ac.uk/fac/soc/al/globalpad/openhouse/academicenglishskills
Discourse markers 2
http://dictionary.cambridge.org/grammar/british-grammar/discourse-markers-so-right-okay