Comparison of adjectives
http://www.english-4u.de/comparison.htm
Exercises
http://www.englisch-hilfen.de/en/exercises/adjectives_adverbs/adjective_comparison.htm
http://www.englisch-hilfen.de/en/exercises/adjectives_adverbs/adjective_comparison2.htm
http://www.englisch-hilfen.de/en/exercises/adjectives_adverbs/adjective_comparison3.htm
Present Simple
http://www.englishpage.com/verbpage/simplepresent.html
the USA
Make up five to ten questions about the USA.