“…Familiar and cooperative interlocutors reduce learners' fear of speaking a L2; while participatory interlocutors contribute to the discussion, thus making learners feel excited in and responsible for delivering information (Kang, 2005 Cao, 2011;Kang, 2005Kang, , 2006, L2 proficiency (e.g., Cao, 2011;Eddy-U, 2015;Kang, 2005), gender (e.g., Eddy-U, 2015; Riasati, 2012), age (e.g., Riasati, 2012), and appearance (e.g., Kang, 2005), have been found to affect L2 learner's WTC as well, although relevant studies are still limited and the findings are tentative and inconsistent.…”