Complete the text with the correct words derived from the words given

Science fiction, also known as sci-fi, is a genre of stories about future [ ]development and its effect on our lives. Some of the common themes of the sci-fi genre are time travels, space [ ]and meeting aliens. Some stories tell us about the alien invasion or space invasion. The aliens in these stories usually invade the Earth to study the humans, enslave them or destroy the planet.

The idea of the alien invasion became [ ]popular in 1898 when H. G. Wells published his novel The War of the Worlds about the attack against the Earth by creatures from Mars. In 1938, Orson Welles made a radio story based on this book. The radio story caused great shock and panic in the USA. Many people thought that it was real news and that the [ ]was really taking place.

There were stories about aliens before the publication of The War of the Worlds, but it is H. G. Wells who is considered to be the first [ ]to contribute greatly to the [ ]of such stories.