Humans like to live and working groups．Language is the"cement"（ 胶合剂）（61）___ holds these groups together．Language is part of culture．Culture，in this sense，（62）___ （mean） all thosecustoms，skills，and attitudes that are part of the behavior of a （63）___ （particularly）group．What you think （64）___ what you want in life are all affected by the culture of the group in which you （65）___ （raise）．Groups of people live in different ways．They may have different skills，organizations，and art forms．Their family life may be completely different from yours．
Human beings are inventive animals．They can decide to change their cultures in order to meet various （66）___ （situation）．Of all living things，human beings are the （67）___ （clever）．They can choose （68）___ （live） in many environments and in a wide variety of ways．Only human beings can choose where and how they wan t to live and then improve the physical environment to help （69）___ （they）realize these choices．
Acquiring the wisdom to make wise choices （70）___ （be）the lasting challenge of being human．
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