Not sure if answer is right, hope someone can

it may or may not be instructional

Explanation:

it could be instructional because of the way you're giving instructions to whomever will ride the roller coasters.

ich statement best shows a problem in travels with charley?

one sharp difficulty presented itself. in the intervening twenty-five years my name had become reasonably well known.

this being so, my trip demanded that i leave my name and my identity at home.

i had to go alone and i had to be self-contained, a kind of casual turtle carrying his house on his back.

with all this in mind i wrote to the head office of a great corporation which manufactures trucks.

the answer should be

the simple past tense of strive.

hope this !