二、单项选择1. The of the Itaipu Dam took 30 000 people seven years.
The patients believe that the doctor knows exactly how to put them _____.
Circus tigers, although they have been tamed, can _____ attack their trainer.
___ is reported that he got severn good medals.
How long ___ to finish the work ?
___ no need for us to discuss the problem again. It has already been settled.