完形的一个空求解释On a mindless Saturday afternoon, a friend and I we

完形的一个空求解释
On a mindless Saturday afternoon, a friend and I were throwing rocks onto the roof of the old lady’s house from a secluded spot in her backyard. The object of our play was to observe how the rocks changed to missiles as they rolled to the roof’s edge and shot out into the yard like comets falling from the sky.
I found myself a perfectly smooth rock and sent it for a （ ） The stone was too smooth, however,so it slipped from my hand as I let it go and headed straight for a samll window on the old lady’s back porch. At the sound o fracured glass, we took off from the old lady’s yard faster than any of our missiles fle off her roof.

答案是ride,选项有trip为什么不行？
此两词用法上有什么限定？