2NA Discourse markers

http://speakspeak.com/english-grammar-exercises/upper-intermediate/despite-in-spite-of-although-even-though-2

http://www.englishbee.net/lessons/advan_exer/although_despite/quiz/quiz.htm

http://www.better-english.com/vocabulary/howeveretc.htm

http://a4esl.org/q/h/9901/gc-connectives.html