----- Nội dung dịch tự động từ ảnh ----- gathered under the rule of local tribal heads. Many ethnic groups divided their population (7) _____ social echelons, especially those who lived in mountainous areas. (8)____ ethnic minorities had mastered some farming techniques. They grew rice plants in swamped paddy fields and carried out irrigation. Others went hunting, fishing, collecting and lived a semi-nomadic life. Each group (9) ____ its own culture, diverse and special. Beliefs and religions of the Vietnamese ethnic minority groups are also (10) from each 5 A and Balthough while however 6 A group B people D peoples 7 A from Binto Cabout D with 8 A An amount of B The number of CA number of D A deal of 9 A had Bhave Chas D have had contrary 10 A opposite B disparate persons comparable