(1)....many years people believed that the clerest animals (2).....man were chimpazees. Now, however, there is prof that dolphins maybe even (3).... than these big apes

(1)....many years people believed that the clerest animals (2).....man were chimpazees. Now, however, there is prof that dolphins maybe even (3).... than these big apes.
Although a dolphin lives in the (4)...., it is not a fish. It is a mammal. It is in many ways, therefore like human beings.
Dolphin have a simple language. There are (5).... to talk to one another. It maybe (6)... for man to learn how to talk to dolphins. But this will not be easy (7).... dolphins cannot hear the kindof sounds that man can make. If man wants to talk to dolphins, therefore, he will (8)... to make a third language which both he and the dolphins can understand.
Dolphins are (9).... very friendly towards man. They often follow ships. There are many stories of dolphins guiding (10)...through difficult and dangerous water.