A. EXPERIMENTING B. EXPERIMENTED C. TO EXPERIMENT D. EXPERIMENT

17. - BAI KIEM TRA LOP 8 SO 1 HK I NAM HOC 2010 2011
Tiếng Anh BAI KIEM TRA LOP 8 SO 1 HK I NAM HOC 2010 2011

17. A. experimenting B. experimented C. to experiment D. experiment