Fill in the blanks with the words and expressions taken from the text. Caucasian Georgians, Hunzas and Vilcabambans all live till very old age. By (1)__________, people in industrial society(2) __________ weak and ill in their 60s and 71s. the three groups (3)__________ the secret of long life. First, they began to do hard,(4) _________ work since childhood and did not have (5)__________ of retiring even though they were 80. they might (6)__________ a bit but never (7)__________. they live at very high (8)__________ where the air has less oxygen. Another very important(9) __________ is that these people are (10)__________the pressures and worries of industrial society. (11)__________ factors also (12)__________ an important role. Finally (13)__________ diets are also crucial to health. All these factors (14)__________ the long life of these people. By the way, the(15) __________ approach to life is also necessary if one wants to live longer.