EXPLANATION AND EXERCISES
http://www.englisch-hilfen.de/en/grammar/adverbien1.htm
http://www.englisch-hilfen.de/en/exercises/adjectives_adverbs/adverbs_of_frequency.htm
http://www.myenglishpages.com/site_php_files/grammar-exercise-adverbs-frequency.php#.VE_ztL5QZ8w
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