Useful websites to study noun clause

http://www.learnenglishfeelgood.com/lefg1_nounclauses1.html

http://www.grammar-quizzes.com/nounclausequiz.html

http://www.learnenglishfeelgood.com/lefg1_adverbnounclauses1.html

http://www.grammar-quizzes.com/nounclause3.html

http://www.learn4good.com/languages/evrd_grammar/quantifier.htm
(with some useful explanation)

http://www.english-zone.com/grammar/noun-clz1.html