ADVERBS OF MANNER

http://learnenglish.britishcouncil.org/en/english-grammar/adverbials/adverbs-manner
http://www.edufind.com/english-grammar/adverbs-manner/
http://www.grammar-quizzes.com/adv_manner2.html 
http://www.ecenglish.com/learnenglish/lessons/adverbs-manner-1 
http://www.learnenglish.de/grammar/adverbmanner.html 
https://www.ego4u.com/en/cram-up/grammar/adjectives-adverbs/adverbs/exercises