While walking the student needed to store his writing insturment away, where did he put it?
Options:
- desk drawer
- cabinet
- purse
- classroom
- pocket
Let's think now! Step-by-step reasoning:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
In his pocket, student can put a writing instrument. While walking, if the student needed to store his writing insturment away then he can put it in his pocket.
So, the final answer is pocket.