Expand v. to become larger in size, number, or amount, or to make something become larger (使)扩大,增加 split v. to divide or separate something into different parts or groups, or to be divided into differentparts or groups 分裂 widowed adj. If someone is widowed, their husband or wife has died. 寡居的,鳏居的 Exercise 1 In this task, you will hear the changing of American family structures. Note comparisons between the past and the present. Listen to the passage and choose the best answer to each of the following sentences. As job patterns changed and the economy progressed __________, people were forced to move to different parts of the country for job opportunities.