Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: (CNN) Aaron Sheldon has never particularly enjoyed riding the bus. But to his young son, Harrison, it is an adventure. "One day we're on the bus downtown, and I'm just sitting there looking at him and he's just in awe of such a mundane and pedestrian task," said Sheldon, a photographer who lives in Columbus, Ohio. It reminded him that even the most ordinary acts can seem extraordinary to someone experiencing it for the first time. "I wanted to try to capture that sense of wonderment that kids have just in our everyday world," Sheldon said. He didn't know the best way to go about it, though, until later that week when Harrison -- 3 at the time -- got an ear infection and had to go to the doctor's office.Aaron Sheldon photographed his son around town in an astronaut costumeThe project is a reminder that children are explorers still learning the world around them 
 Question:Many of the locations were inspired by questions _ asked his father about astronauts.

Harrison