The imaginative worlds presented in science fiction may not be so far-fetched as readers think they are. ＿＿（17）＿＿ Mary Shelly completed Frankenstein in 1818, science fiction has been the precursor of new scientific discoveries and inventions. Robots, organ transplants, space travel, and other scientific inventions ＿＿（18）＿＿ considered wild imagination are now realities. Will all those odd-looking species we see in the movie series Star Wars be actually found somewhere in a remote corner of the universe? Will there be ＿＿（19）＿＿ one day launching attacks from the skies to destroy human beings or will they knock on our doors to say hello? Will human beings eventually scatter the universe with space colonies? Or can we travel to and fro freely between the past and the future with a time machine? All of these questions are still waiting to be answered with the passing of time.