It was going to be some time _____ he would see his father again.
. The temperature can fall to –50°._____ is, 50°below freezing point.
She likes to use words ____ is clear to him.
Babies are not born with __ moral sense; they cannot tell __ difference between right and wrong.
She soon came to her ____ after a blood transfusion.
. Every new thought or idea has to ___ what we already know.