Chapter 13

http://web2.uvcs.uvic.ca/elc/studyzone/410/grammar/advcls1.htm
http://www.learnenglishfeelgood.com/lefg1_adverbclauses1.html
http://a4esl.org/q/h/mb/adv_cause.html
http://a4esl.org/q/h/mb/adv_conditional.html
http://www.tolearnenglish.com/exercises/exercise-english-1/exercise-english-510.php
http://esl.about.com/library/quiz/bl_adverbclause.htm
http://hi2en.com/grammarquiz.aspx?type=Grammar&id=2681
http://buckhoff.topcities.com/adverbclauses.htm#Quiz%201:%20%20Adverb%20clauses--time%20relationships
http://buckhoff.topcities.com/adverbclauses.htm#Quiz%202:%20Adverb%20clauses--cause%20and%20effect%20relationships
http://buckhoff.topcities.com/adverbclauses.htm#Quiz%203:%20Adverb%20clauses--unexpected%20results
http://buckhoff.topcities.com/adverbclauses.htm#Quiz%205:%20Adverb%20clauses--conditional%20meanings