Prasetiawati, Eka. 3213073047.2011. Improving vocabulary mastery by using inquiry technique In The Seventh grade of Islamic junior high School at Durenan Trenggalek, In academic year 2010/2011.Thesis. Undergraduate program in English Education. State Islamic College (STAIN) of Tulungagung. Advisor. Nanik sri rahayu, M.pd Key words: Improving, Vocabulary Mastery, Inquiry Technique …