填空题 .The first Asian immigrants in the U. S. were     1    . They were very     2    and successful people from different businesses. During the California     3    , a large number of Chinese people began to immigrate and settle down in California, near San Francisco. They worked hard and lived frugally there. As the number rose, they formed     4    districts called Chinatowns. The early Chinatowns were slum areas in the 1800s, but later became quiet and colorful     5    .

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