enough too

http://www.englishexercises.org/makeagame/viewgame.asp?id=3110
http://www.tolearnenglish.com/cgi2/myexam/voir2r.php?id=10731
http://www.myenglishpages.com/site_php_files/grammar-exercise-too-enough.php
http://www.montsemorales.com/gramatica/Tooenough.htm

present perfect

http://www.mansioningles.com/listening02.htm
http://www.mansioningles.com/listening29.htm
http://www.adelescorner.org/grammar/pres_perfect/pres_per_vs_past_simple.html
http://ingles.iesboliches.org/activities/grammar/tenses/simplepast_presentperfect.htm

present simple

http://www.english-room.com/4_01.htm
http://www.englishexercises.org/makeagame/viewgame.asp?id=2829
http://esl.fis.edu/grammar/single/pressimp1.htm
http://www.englishlab.net/hp/quiz2_present_simple_2_add_es.htm

contrast purpose reason result linkers

http://www.englishexercises.org/makeagame/viewgame.asp?id=1792
http://www.authorstream.com/Presentation/fergonco66-1554321-connectors/
http://www.iesdamasoalonso.es/elynx/uploads/archives/Linkers-UI.pdf

comparison diver

http://www.englishexercises.org/makeagame/viewgame.asp?id=2070
http://www.ego4u.com/en/cram-up/grammar/adjectives-adverbs/adjectives/compare-exercises
http://www.ego4u.com/en/cram-up/grammar/adjectives-adverbs/adjectives/exercises
http://www.adelescorner.org/grammar/comparatives/comparatives2.html
http://www.learnenglish.de/Games/Adjectives/CompSup.htm
http://inglesnanet.com/grammar/superl.htm