The periods of light and darkness the moon created were the first accepted periods of time

The period of adolescence, i.e. , the person between childhood and adulthood, may be long

The wealth of a country should be measured in the light of the health and happiness of its

College is one of the most crucial periods in the growth and development of an individual,

The lights went out and she had to______for her glasses on the bedside table in the darkne

The______resulted in the victory of the capitalist system in England and a new period of h

The American dream is most plausible（似乎可信的)during the periods of productivity and wea