____ nearly all behavior is learned behavior is a basic assumption of social scientists.
—Was he nervous when facing the interviewers?—He is ________, and he even made some jokes.
— What caused the party to be put off?— ________ the invitations.
Nowadays many parents are trying to either prevent their children from failure, or protect them from the knowledge ________ they have failed.
From the tears in Nedra’s eyes we can conclude that something sad _________.
But for my teacher’s help when I was in the senior high school, I ________ in Fudan University now.