Identify what literaray device is given

_________ 1. He was like an admirable general who experienced years of battle as he confidently spoke.
_________ 2. I’m so hungry I could swallow a cow!
_________ 3. After several years in high school, graduating left a bittersweet feeling in her heart.
_________ 4. Like a steady stream of water, he was relentless in his run towards the finish line.