______ nearly all behavior is learned behavior is a basic assumption ______ has been put forward by the social scientists.
When the traveler felt tired, he stopped ___.
She felt ___ Henry were a member of her own family.
Is it only recently ___ he has had a family himself?
The young man in Liaoning decided to go round China ___ bike.
Machines made today are much better than __ of 1950s.A. that B, those C. the ones D. which