What is the blank space that borders the written area of a manuscript?

How do i can change this sentence : a modern physician in a small town not only is proficient in general medicine but surgery as well. to parallel structure?

How and why does king use the word redemptive to link the concepts of freedom and religious faith

Ineed . we can conclude that bartenders and street musicians “seed” their tip cups mainly to: a. make it look as if they are rich b. offer money to others c. encourage people to tip them d. all of the above