____ nearly all behavior is learned behavior is a basic assumption of social scientists.
| A．/ | B．That | C．It is acceptable | D．When |
Circus tigers, although they have been tamed, can _____ attack their trainer.
| A．unexpectedly | B．deliberately | C．reluctantly | D．subsequently |
The patients believe that the doctor knows exactly how to put them _____.
| A．correct | B．perfect | C．right | D．well |
They decided to leave the waiter a big _____ because the food and service had been excellent.
| A．note | B．reward | C．tip | D．gift |
There was a good _____ of the countryside from the front of the bus.
| A．sight | B．view | C．scene | D．scenery |
This album is _____ as it was the only one ever signed by the President.
| A．unusual | B．unique | C．rare | D．special |