And something clearly changed at the beginning of the 20th century.

Many homeowners neglect to change air filters at the beginning of the season.

The cup format was changed with a round-robin group stage at the beginning of the season.

Rash's skin has changed in appearance once at the beginning of the series.

The rules are typically changed between games, either at the beginning or with each successive game.

I've changed the key at the beginning of the year every year.

The weather began to change in a fundamental way at the beginning of the week that followed.

However his life changed at the beginning of the '60s when he got married and start working on TV.

The color of the title changed at the beginning of each season.

Students have the option to change the format at the beginning of any school year.