Answer:
A writer leaves an assumption tacit or implicit.
Explanation:
The writer could leave an assumption tacit or implicit. The reason might lie down in the writer's intention to give space to readers to figure out why the assumption of this specific is implicit. 
The writer might want readers to read more carefully and discover why some characters or why some actions are happening. Also, some assumption is a trigger for some actions or motivation for characters. 
If a writer doesn't write a novel or fictional book, the assumption might be a sign for readers to figure out or conclude some experiments or natural law or biological order in nature. The assumption makes the reader thinks about it and tries to find a solution for it.
 
        
             
        
        
        
Some colleges require that each potential student completes an essay.
Subjunctive mood is defined as the verb form used to express a wish, a suggestion, a command, or a condition contrary to fact.
To convert the above sentence into a subjunctive mood, REPLACE REQUIRE WITH PROPOSE.
Some colleges propose that each potential student completes an essay.
In this case, propose means a suggestion.  
        
             
        
        
        
Answer:
She is seen as intimidating towards others without having to do anything.
Explanation:
As I read it, I read how she was able to be a "mortal danger", "Exquisite", "A trap set by nature", and "Her smile has known perfection" without even really having to try. She is able to be feminine while also holding a strong 'pose' as others might call it.