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

Traditionally, rural villages in Vietnam (19) ______ handicrafts when they were not busy (20) ______ planting or harvesting crops. Over time, (21) ______ villages developed the expertise to make specialized products and so particular villages became famous for such things as weaving, woodwork, lacquer work and metal products. With I industrialization, many villagers moved to the cities but maintained their craft skills and networks to produce products for the city market, (22) ______, craft villages make furniture, grow flowers or make utensils for the urban population. Other villages changed from (23) ______ traditional crafts to producing different products desired by an industrialized (24) ______.