Countable vs. uncountable (much/many, some/any, less/fewer, etc)

Some exercises on countable and uncountable expressions:

http://www.better-english.com/easier/howmuch.htm
http://www.better-english.com/grammar/few.htm
http://www.better-english.com/grammar/few2.htm
http://www.better-english.com/grammar/counta.htm