adverbs of frequency

Click the links and train the adverbs of frequency.
http://www.englisch-hilfen.de/en/exercises/adjectives_adverbs/adverbs_of_frequency.htm
http://www.englisch-hilfen.de/en/exercises/adjectives_adverbs/adverbs_of_frequency1.htm
http://www.ego4u.com/en/cram-up/grammar/word-order/exercises?11
http://esl.lbcc.cc.ca.us/eesllessons/adverbfreq/adfreqz.htm
http://perso.wanadoo.es/autoenglish/gr.frequ.i.htm