THE APPLICATION OF GROUP INVESTIGATION METHOD IN TEACHING SPEAKING TO IMPROVE STUDENTS’ PARTICIPATION OF SMA NEGERI 1 RONGKOP 2014/2015 - Pembimbing: Priyanto, Slamet,PURWANTI, YUNI,Pembimbing: Hadi, Purwanto (Prodi Bahasa Inggris, FKIP, UST, 2015)