根据短文内容，用方框中所给单词的适当形式填空，每词限用一次。

    Are robots as smart as humans? Scientists are now to make robots look like humans and do the same things as we do. Some robots in Japan can walk and dance. They are fun . However, some scientists believe that although we can make robots move like people. There will be to make them really think like a human. For example, scientist James White thinks that robots will never be able to wake up and know they are. But many scientists disagree with Mr. White. They think that robots will even be able to talk humans in 25 to 50 years. Everything is possible in the future.