The northern parts of the United States get very cold in the winter. It snows a great deal and the temperature often goes( 1)zero in January,(2)and March. But the northeastern and north central regions of the country(3)financial and industrial centers for a long time, and they are heavily polluted. In recent years, people in these regions have begun to take vacations (4)these cold winter months. They go to the southern parts of the country( 5)it is warmer. Many go to Florida where the climate is( 6). Others go to the southwestern states like Arizona, New Mexico and Texas where they (7)a dry desert climate. It has become (8)nowadays for old people to move south to these places( 9)they retire. Typically these people sell their houses in their original communities and move south to begin a new life (10 )senior citizens. Their children probably have homes (11) and many of them are moving south(12)communities where they were (13) .The southern and southwestern parts of the country are now growing (14) any other part.Business and industry have (15)many offices and factories in the south. California is already the most popular state in the country.