He kept up at it all night.
Martha kept up a steady stream of reminiscences; I'm sure for Howie's benefit.
At least Hell kept up with the latest styles, she thought darkly.
Donald Ryland kept up a nonstop conversation with his son and front seat companion, as they whipped along the highway.
His shove almost drove her to her knees again. She steadied herself and looked up in time to see him disappear into the jungle. Fear made her heart pound. The strange path he'd been following appeared ahead of her, revealing itself only a few steps at a time. She started at a walk and quickened to a jog, making sure the path wouldn't close and trip her. The path kept up with her, and she ran.