These changes occurred at the end of the 19th century.

Something else occurred to me, more important at the moment.

The most recent one occurred at the end of the 112th Congress in 2012.

But may occur at any other time of the year.

However, cases can occur at any time during the year.

He was about to leave when an idea occurred to him at the last moment.

They always occur at night and go away by the morning.

Similar conditions had already occurred at the beginning of the month.

Does the pain occur at the same time each day?

This probably occurred at some point during its first 700 or 800 million years of history.