Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate option that best fits each numbered blank from 19 to 24.

Viet Nam is a multi-nationality country with 54 ethnic (19) ______. The Viet (Kinh) people account (20) ______ 87% of the country’s population and mainly inhabit the Red River delta, the central coastal delta, the Mekong delta and major cities. The other 53 ethnic (21) ______ groups, totalling over 8 million people, are scattered over mountain areas (covering two-thirds of the country’s territory) spreading from the North to the South. Among ethnic minorities, the largest ones are Tay, Thai, Muong, Hoa, Khmer, and Nung with a (22) ______ of around 1 million each, while the smallest are Brau, Roman, Odu with several hundred people each.
A number of ethnic minorities had mastered some farming techniques. They grew rice plants in swamped paddy fields and carried out irrigation. Others (23) ______ hunting, fishing, collecting and lived a semi-nomadic life. Each group (24) ____ its own culture, diverse and special. Beliefs and religions of the Vietnamese ethnic minority groups were also disparate from each other.