Who’s _____ woman in purple—Peter’s mother. She works in ______university.

they are brothers, they don’t looklike each other at all

ance, ______ you go, you will always see a gentleman holds a door for a lady.

下列各句中，加横线成语使用恰当的一项是

Human facial expressions differ from those of animals in the degree ______ they can be controlled on purpose.