In China, shaking hands with each other is a common________ when people meet for the first time.
Feudal landlords, and imperialists are in no way more _____ than wolves.
She was putting on her watch when the _____ broke and it fell to the ground.
Psychological studies show that some people are quick-tempered _____.
The _____ stuck on the outside of the envelope said "By Air".
It was the largest experiment we had ever had; it _____ six hours.