单项选择题Anxiety about financial matter lessened somewhat when, in 1910, the United States accepted responsibility for Liberia's survival.
单项选择题We will set off after he finishes packing.
单项选择题The steadily rising cost of labor on the waterfront has greatly increased the cost of shipping cargo by water.
单项选择题Can you account for your absence from the class last Thursday
单项选择题People from many countries were drawn to the United States by the growing cities and industries.