God only knows if I can live out the 20th century.

We are living in the latter half of the twentieth century.

Briefly stated, Hobsbawm's thesis is that the history of the twentieth century is that of the decline of civilization.

There is no telling how far science may have progressed by the end of the twentieth century.

In the course of the twentieth century all this changed.

Afghanistan and Iran both changed their national anthems several times in the course of the 20th century.

The view of the Earth from the Moon is one of the iconic images of the 20th century.