Which element does not have to be cited in an academic paper

What is the meaning of the word checking as it is used in this sentence from the second paragraph of the passage?

Now long and short works of fiction have different characteristics beyond simply the length of the work. think of a short story that you like and a longer work (novel or novella) that you like. you can use the story and novella from this unit if no other works come to mind quickly. discuss the elements of each work that made it enjoyable to read. what relationship did the form of the work (short story, novella, or novel) have in making it an enjoyable read? what elements of fiction were strongest in the work, and how did they impact your enjoyment of the story? compare the two works you chose. how are they representative of short fiction versus longer forms of fiction?

Acontainer hold 4 gallons of lemonade.a large lemonade contains 16 ounces. how many large lemonades could the restaruant sell before they run out of lemonade?