________ nearly all behavior is learned behavior is a basic assumption ________ has been put forward by social scientists.
He changed so much that I didn’t _______ him at first sight.
Do you know when ________?
I don’t think she is a nice woman;I’m ______ her empty talk.
____ you promise to buy her a gift, you can’t break it in any case.
He realized she was crying ________ what he had sad.