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       Some scientists do not wear laboratory coats (coat). And only _______(rare) do they use microscopes. These scientists are called________(society) scientists. They want to find out how people act and why they do certain things.
       Some of them study the people of______(differ) cultures to learn their ways of doing things. They often live with the people of the culture they are________(study). They try to feel the world of these people. And they must be good reporters because facts, not_________(opinion) about other cultures, must be reported.
       Another group of them studies how people_________(live) long ago. They dig in the ground to find old tools that have been_________(bury) for thousands of years. Sometimes, they even discover buildings hidden in the earth. 

       These scientists often work in________(cooperate) with each other. If one of them_________(find) a Greek vase (花瓶）in the Middle East, he or she may ask for an_________(explain) from an expert to find out how the vase got there.