Write higher or lower. 1. A man’s voice is _____ than a woman’s voice. 2. A baby’s voice is _____ than a man’s voice. 3. On a guitar, the sound of a thin string is _____ than the sound of a thick string. 4. The sound of a plane is _____ than a bird’s song. 5. A girl’s voice is _____ than a man’s voice.