When travelling overseas, do you buy water in plastic bottles or take your chances with tap water? Imagine you are wandering about on a Thai island or _26_ the ruins of Angkor.
A. adequate
B. admiring
C. contains
D. defending
E. evidence
F. instant
G. liquid
H. modified
I. natural
J. potential
K. released
L. revealing
M. sealed
N. solves
O. substance