The students were all ears as their teacher spoke.
Slang of the day: all ears
Meaning: to listen carefully and attentively
Usage: When my husband speaks; I’m all ears.
Dialog:
Doug – Did you hear what the teacher said in class today about the test?
Peter – Nope, I fell asleep.
Doug – Really? You should be all ears or you’ll end up failing for the year.
Peter – So.
Doug – Well, if you don’t care, never mind.