Nitric acid is a colorless _______ liquid with a sharp choking odor, and therefore it must be _______ stored in tightly-stoppered glass bottles to prevent the fumes from escaping.
A. seamless .. handily
B. volatile .. prudently
C. coagulated .. haphazardly
D. homogeneous .. periodically
E. viscous .. particularly
Volatile means readily vaporizable at a relatively low temperature. Prudently means to act with wisdom or judiciousness.