With ________ word “PM 2.5” repeatedly appearing in ________ media reports, the public can’t help wondering what it really means.
____ is a good form of exercise for both young and 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.