How to use "sliding" in a sentence

Sure enough, the dolphins set off, their smooth, strong bodies sliding through the ocean

The sliding closet doors began to move on their runners, and Vivienne Neddler had the feeling that some awful thing was going to come out of the dark space, its eyes as red as blood and its razor-sharp teeth gnashing

Dusk was sliding into night

Opposite the sliding door through which she and Elliot had entered, the security room was another door of more ordinary dimensions and construction