How to use "activity" in a sentence

Today is the third day of an activity holiday

Owen is tall and fair with blue eyes and a healthy complexion from years of work and activity outside.

The frantic activity and the unrelenting excitement, which bordered on hysteria at times, abraded her nerves.

Furthermore, this was not the mid-nineteenth century; these days, doctors could detect even the vaguest heartbeat, the shallowest respiration, the dimmest traces of brain-wave activity.

When they had landed, they'd been alert for unusual activity on the runway and in the private-craft docking yard - suspicious vehicles, an unusual number of ground crewmen - but they had seen nothing out of the ordinary

Zachariah moved to another bank of computer screens, where Danny Evans's heartbeat, blood pressure, body temperature, and brainwave activity were constantly displayed

"Odd brainwave activity

She rarely answered questions and spent a lot of her time sewing, hut her favourite activity seemed to be catching flies, which she always released unharmed after examining them carefully.