at work

Then again, it was midday and all the household staff were hard at work.

She smiled the innocent smile of a master criminal at work.

No doubt it was the holiday fatigue at work, but Penelope could scarcely bring herself to sightsee as they walked.

He’d already disobeyed his mother by leaving the apartment while she was at work.

That meant we could carry people’s luggage through the front doors, but when we arrived at work, we were never to go through the main entrance.