A．Because millions of men died in the war.
B．Because women had proved their worth.
C．Because women were more skilful than men.
D．Because factories preferred to employ women.

A．The workingman laid a firm foundation for the whole nation.
B．The land has an abundance of natural resources.
C．The United States has some of the best farm lands in the world.
D．People from many countries brought with them a wealth of knowledge.