https://english2belle.files.wordpress.com/2014/03/adverbs-frequency-1.gif |
http://www.myenglishpages.com/site_php_files/grammar-exercise-adverbs-frequency.php
https://elt.oup.com/student/solutions/elementary/grammar/grammar_02_012e?cc=pt&selLanguage=pt
http://www.englisch-hilfen.de/en/exercises/adjectives_adverbs/adverbs_of_frequency.htm