There is strong evidence that the          of a father increases the probability that a youngster will use drugs and engage in criminal activity.

Books are a worthy invention of human history since they make it possible for us to make a__of human’s thoughts.

Achieving a high degree of proficiency in English as a foreign language is not a mysterious _____  without scientific basis.

It is our ______ to enjoy the moon on Mid-Autumn night.

When I arrived in this country, I had to start learning the language from _____.