The last half of the nineteenth century ________

The last half of the nineteenth century ______ the steady improvement in the means of trav

During the first half of the twentieth century, the average American household was ______

When she was over fifty, the late nineteenth century mother______.THE GREATEST RECENT SOCI

Many Europeans______the continent of Africa in the nineteenth century.A．explodedB．expanded

From industrial beginnings in the nineteenth century, plastics______through a hundred and

______the beginning of the nineteenth century that the creation of more universities was s