___ nearly all behavior is learned behavior is a basic assumption of social scientists.

To make himself________, the old professor had to______his voice[ ]

Do you know our town at all?—-No, this ________ the first time I _________ here

There is no________ that students will listen attentively in class, if they are _____ The World Cup in South Africa at night

I am going to Sanya for my holiday tomorrow.—_____________.