Mandy saw his mouth drop open, then saw understanding slowly enter his face.

Polysorbate 20: Used as a wetting agent in mouth drops.

I saw his mouth drop open, his face twisted in a mask of terror.

Emmi blinked and looked over to see Abulurd's mouth drop open in shock.

The unexpected statement made Rob's mouth drop open in wonder.

From the corner of his eye, Nathaniel could see Charles' mouth drop wide open.

I saw his mouth drop open in horror.

"Unless it wasn't really Regis," she offered, and her own words made her mouth drop open with their terrible implications.

When she saw Emma's mouth drop open in shock, her heart was lost.

I saw her mouth drop open in shock as she looked harder at the creature standing beside Bill.