Researchers in Italy say    drinking may lengthen your life, while too much may shorten it. 

In order to help people to see the performance at the same time, they gave a _____ broadcast. 

He gave me some very _____ advice on buying a house.

His friends were ___________and encouraged him to publish his ideas, but Copernicus was cautious.

After two years’ research, we now have a _______ better understanding of the disease.