6. Vietnam is a country of great .with 54 ethnic groups. (diverse) II. Read and answer the questions Among ethnic minorities in Vietnam, the largest ones are Tay, Thai, Muong, Hoa, Khmer, and Nung with a population of around 1 million each, while the smallest are Brau, Roman, Odu with several hundred people each. The Cham, Tay, Nung, and Khmer ethnic groups had reached high levels of development with the presence of various social classes. The Muong, Mong, Dao, Thai ethnic groups gathered under the rule of local heads. Many ethnic groups divided their population into social echelons, especially those who lived in mountainous areas. 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 has its own culture, diverse and special. Beliefs and religions of the Vietnamese ethnic minority groups were also disparate from each other. (Source: Adapted from Chinh Phu) 1. Are the largest ethnic minorities in Vietnam Tay, Thai, Muong, Hoa....? 2. Which ethnic groups in Vietnam have the smallest population? 3. What did they grow? 4. What does the word "irrigation" in line 8 mean? 5. Find the words close to the meaning diverse in line 10?