The Tay live mainly in the Northeastern part of Viet Nam. They live in large and crowded villages with hundreds of houses. They live in houses built on stilts. They are mainly farmers and they grow rice on terraced fields. They also raise cattles and poultry. Tay traditional dress is made from homegrown cotton. There is usually not much embroidery or other decorations. Women wear skirts or trousers, with short shirts inside and long one on the outside.They have many festivals and holidays in a year. The Lunar New Year and the mid-July festivals are the most lavishly organized. During festivals, people in many places play con throwing,badminton, tug-of-war, dragon dancing, or chess. The Tay eat mainly sticky rice. On festival occasions, they make many kinds of cakes, such as banh chung (sticky rice square cakes), banh day (sticky rice round cakes) or banh khao (cakes made of white rice flour). 17.Which of the following best describes the main idea of the passage? A. The Tay live in the Northeastern part of Viet Nam. B. The Tay make many kinds of cakes on festival occasions. C. The Tay have many festivals and holidays in a year. D. The life of the Tay in Viet Nam. 18.What do the Tay mainly eat? A. sticky rice C. sticky rice square cakes B. sticky rice round cakes D. cakes made of white rice flour 19.Which of the following is NOT true of the Tay? A. They live on stilt houses. B. They grow rice on terraced fields C. They wear clothes with much embroidery. D. They eat sticky rice. 20.Which is true of the Tay’s life? A. They mainly work in agriculture. C. They have one very important festival a year B. They work in industry. D. They buy cotton to make dress. 21.The word "lavishly" is closest in meaning to ______. A. seriously B. carefully C. luxuriously D. lengthily