Science fiction and fantasy are interrelated, and it can be hard to tell the difference between the two. The two terminologies( 术语 ) have been widely __1__, and it is very difficult to draw a line between the two. In the words of great writer, Issac Asimov, science fiction is based on technology and science and is possible. Science fiction can be about __2__ and space and has its bases in science. On the contrary, fantasy is only imaginary, and __3__ things that do not exist in real life. Fantasy can be about talking animals or something __4__. Science fiction shows things that could possibly take place in the real world. Fantasy adds realism to things that are unlikely to happen. When compared to fantasy stories, the imaginary elements in science fiction can __5__ be possible. Though the topic in science fiction can be contrary to reality, these stories are based on some fact that is absent in fantasy. Unlike science fiction, fantasy uses supernatural forms and magic in its __6__. Science fiction can be divided into different kinds, such as hard science fiction, soft science fiction, social science fiction, time __7__, military science fiction, super human fiction and space fiction. Fantasy can be divided into horror fiction, __8__ fiction, super hero fiction and community. However, as fantasy fiction becomes more focused on modern environments, rather than __9__ worlds, technology plays an increasingly important role in the stories, thus leading to the birth of Science Fantasy, just in time to meet the audience mourning a slowdown of Science Fiction. Science fantasy has several characteristics. Magic is still extremely obvious. The level of characterization differs greatly __10__ on the story.