How to use "frantic" in a sentence

Gradually Vivienne's heartbeat subsided from the hard, frantic rhythm that it had been keeping for the past couple of minutes

He was desperate to get out, and she was frantic to rescue him; but he was chained, unable to climb, and the sides of the pit were sheer and smooth, so she had no way to reach him

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