Theodore Roosevelt became president of the United States at the beginning of the twentieth century.

VOA: special.2010.08.12

The expression was first used in America at the beginning of the twentieth century.

VOA: special.2009.11.15

At the beginning of the nineteenth century, Jean-Baptiste Lamark attempted a fuller explanation.

VOA: special.2009.12.01

Theodore Roosevelt became president at the beginning of the twentieth century.

VOA: special.2010.08.05

His wife lived until the beginning of the new century.

VOA: special.2009.12.23