How can the author keep the story moving/full ?

By adding details of the surroundings,

Explanation:

You haven't said the full question, but writers often zoom into - small things in the setting

Like trees, peoples features /clothing, the weather ect

I hope this helps

onto a large boat, and mark the water level that the boat sinks to. then, take the elephant out and put a bunch of marked weights onto the boat until it reaches the same water level. add up the masses of the weights to get the weight of the elephant.

answer: do

the 'italicized phrase' is a noun clause that is used as a direct object.