Hello kids! Here are more exercises on the comparative and superlative degrees

http://www.better-english.com/grammar/comparatives.htm
http://speakspeak.com/html/d3a21_english_grammar_practice_comparatives.htm
http://www.prof2000.pt/users/tereza_n/adj_comp.htm
http://www.oup.com/elt/global/products/englishfile/preint/a_grammar/file04/grammar04_d01/
http://www.oup.com/elt/global/products/englishfile/preint/a_grammar/file04/grammar04_d02/