The question may ask to write based on the comprehension text or on a separate picture/text, so read carefully. Try to keep the theme of the story close to the original, but not the plot to show that you've understood the text and aren't just rewriting it in different words. Use language to build the genre, so for a story on exploring try to create tension through descriptions of the scene, maybe with foreshadowing of what's about to happen. Punctuation such as ellipses can help to build up to the final discovery. Try not to overuse techniques like these though because they can be distracting from the plot. Your story also doesn't need to be like a novel with a beginning, middle and end, but make sure to introduce the characters, show some action, and have a clear ending (perhaps the moment something interesting is discovered while exploring, or the end of an exploration).