As the most acute one in _______ history of all epidemics, the Spanish Flu had ______ tendency to strike the young and fit rather than the old.
“May I take your order now?” “We’d like three black _______ and two green _______.”
The lion is considered the king of the forest as it is a(n) _____ of courage and power.
Just as a famous Chinese saying goes, a timely heavy snow is a ______ of good harvest next year.
Those black clouds are a sure _____ that it’s going to rain.
She raised her finger to her lips as _____ for silence.