Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct wordfor each of the blanks.

Scientists say that (44) _______ the next thirty years we will not be able to tell the difference between the real people and the virtual people- that is, people created by computer. These virtual humans are already in films and computer games and engineers are setting up experiments to see if they can develop a (45) _______ feeling virtual people. And the prediction is that these virtual people will be better than us humans- because they are basically a machine, they can (46) _______ data and remember it much better than we can. In addition, they are starting to look much more like us. They are already used to (47) _______ research that may be dangerous for humans, such as on equipment for the army. The “virtuals” are very good at following procedures exactly so scientists can get reliable results. Engineers are carrying out further tests to find out how to get the virtual beings to understand conversation. Now, we can only “talk” to them by typing. But if you (48) _______ the internet, you will find more and more sites devoted to virtual humans- we are just at the beginning of what they can do.