It’s hard to imagine a large city without policemen, but such was the ______ in London in the early 18th century.

The young man made a _________ to his parents that he would try to earn his own living after graduation. 

Many people like white color as it is a ________ of purity.

The moonlight was quite bright, and about fifteen yards up the road there was a deep _______ thrown by a tree.

—Li Lin is very bright and studies hard as well.—It’s no ______ he always gets the first place in any examination.