1. Nick would like to know something about the.....groups of Viet Nam when he visited the Museum of Ethnology.
=> Chỗ trống cần điền thêm một tính từ
=> Nick would like to know something about the cultural groups of Viet Nam when he visited the Museum of Ethnology.

2 He is surprised.....that there are 54 ethnic groups in our country.
=>Cụm từ: be surprised to + V-nt ( bất ngờ khi làm gì)
=> He is surprised to know that there are 54 ethnic groups in our country.
3The Viet (or Kinh) have ........ number of people, accounting for about 86% of the population.
=> Chỗ trống cần điền thêm một tính từ ở dạng so sánh nhất
=> The Viet (or Kinh) have the largest number of people, accounting for about 86% of the population.
4 Nick was told that ethnic minority peoples have their own ways .... life and traditions.
=> Cụm từ: way of life (cách sống)
=> Nick was told that ethnic minority peoples have their own ways of life and traditions.

A -> B -> C -> A

gth: Hiện tại đơn, quá khứ tiếp diễn, hiện tại tiếp diễn, tương lai đơn