Japanese companies have already made robots ________.

A. to walk and dance

B. walking and dancing

C. walked and danced

D. walk and dance

  In some science fiction movies, people in the future have___46__ own robots. These robots are just like__47___. They help with the most unpleasant jobs.

     Some scientists believe that there ___48__ such robots in the future. But it may take___49__of years, Japanese companies have already made robots walk and dance. But some scientists___50__. They think that it will be difficult for a robot___51__ the same things as a person.

     In the future, there will be more robots__52___, and humans will have ___53__work to do than before. New robots will have many different___54__. After an earthquake, a snake robot could help look for people__55___ buildings. That may not seem possible now, but computers, space rockets seemed impossible a hundred years ago.