ok first of all, they are asking you to make a story that includes the words :
summit, accustomed, streamlined, essential, secure
in other words (no pun intended), you simply need to be creative, that is the whole point of these kinds of assignments, my story using these words is:
I am accustomed to driving a secure, streamlined car up to the summit of the mountain, so it is essential I put gas in the car.
you may use this as your answer or as simply an example, it won't affect me, but again, the whole point is to stretch your creativity, not mine. Hope you do well on your assignment.
