There are many different kinds of stories. Detective (侦探) stories have been popular since Conan Doyle ____ (write) his famous stories about great detective Sherlock Holmes. Readers read this kind of stories mainly for pleasure.

    In a story, a man was murdered. Who did it and why? Mr X hated the dead person and wanted ____ (kill) him, but had no chance. He was somewhere else when the murder ____ (take) place. Mr Y could do it ____ (easy), but seemed to have no reason to do it. Mr Z had reason for killing him ____ he had already got all the dead ____ (man) money. Was X, Y or Z the murderer? Or was it somebody else? In the end, the detective will find out the answers ____ all the questions, and the story will not end until the mystery ____ (solve).

    The ending is always unexpected. The criminal turns out to be that nice Mr C, who you thought would never hurt ____ ant! At the end of the story, all the clues become clear and you will say, "Oh yes, of course, it is the ____ (true)."