Highlight the vowel sound that is repeated in each phrase.

"Just trust me", said Will.
She dipped her toes into the cool of the pool.
Dennis was riding high on the thrill of his win.
He paused, then stepped onto the lawn with caution.

"Just trust me", said Will. (u sound)

She dipped her toes into the cool of the pool. (oo sound)
Dennis was riding high on the thrill of his win. (i sound)
He paused, then stepped onto the lawn with caution. (o sound)