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Present perfect simple and Present perfect continuous practice: http://learnenglish.britishcouncil.org/en/grammar-reference/present-perfect-simple-and-present-perfect-continuous
A reading and listening about cultural diversity: http://www.bbc.co.uk/worldservice/learningenglish/language/wordsinthenews/2012/05/120521_witn_changing_america.shtml
Some ideas for starting "small talk": http://www.englishclub.com/speaking/small-talk_conversation-starters.htm
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Present Simple vs Present Continuous review: http://www.ego4u.com/en/cram-up/grammar/simpre-prepro
Past Simple review: http://learnenglish.britishcouncil.org/en/english-grammar/verbs/past-tense/past-simple
A reading and listening about gentically modified crops: http://www.bbc.co.uk/worldservice/learningenglish/language/wordsinthenews/2012/05/120504_witn_gm_crop.shtml
A video comprehension about a glacier in Argentina: http://www.bbc.co.uk/worldservice/learningenglish/language/wordsinthenews/2012/03/120306_vwitn_glacier.shtml