GRE Text Completion: Fundamental 24 Sets-GRE填空基础24套 - 5JZ0YI61SW0N38G1!

Geysers vary widely: some may discharge (i)____________, whereas others may have only a brief explosive eruption and then remain (ii)____________ for hours or days. A. vehemently B. dangerous C. continuously D. quiescent E. spontaneously F. unpredictable