A, AN, THE , NO ARTICLE

Here you have some exercises:

http://www.englisch-hilfen.de/en/exercises/nouns_articles/a_the.

http://www.learnenglishfeelgood.com/mixed-english-articles5.html

QUANTIFIERS

Here you have some exercises in case you need to revise quantifiers:

http://www.grammarbank.com/quantifiers-exercises.html

www.englishexercises.org/makeagame/viewgame.asp?id=3198

COMPARISON IN ENGLISH (ADJECTIVES AND ADVERBS)

Click in the links below for further practice:
http://www.englishexercises.org/makeagame/viewgame.asp?id=3565
http://www.englishexercises.org/makeagame/viewgame.asp?id=2065
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises?08
http://learnenglish.britishcouncil.org/es/english-grammar/adjectives/comparative-and-superlative-adjectives
http://www.ego4u.com/en/cram-up/grammar/adjectives-adverbs/adverbs/exercises?02
http://learnenglish.britishcouncil.org/en/english-grammar/adverbials/comparative-adverbs