simple, would be the correct answer  
(context) plain means ordinary, primary means first and essential means is always needed.
(more context) even though you should do spell check it shouldn't be first and isn't always needed and part of spell check is to make it so it's not plain
 
        
                    
             
        
        
        
I think the answer may be “it helps the reader understand how precise the dive was”
        
             
        
        
        
It is answer B. Many buses in the terminal are waiting to depart.
        
                    
             
        
        
        
Answer:
R
Explanation:
we speak British English and not American English
 
        
             
        
        
        
Answer:
This lines from Edgar Allan Poe's "The Cask of Amontillado" provides an insight into narrator's mercilessness. Fortunato's last and soft cry of fear made Montresor's heart grow sick. Narrator's ascribing this sickness to cold weather shows that he is a biased narrator.
Explanation:
The narrator of the story "The Cask of Amontillado" speaks in first person. Since he is justifying his act of murdering one of the fellow men, his viewpoint is unbalanced. The view point is also partial because we know almost nothing about Fortunato (the antagonist - about to be murdered). 
Almost all the narrative of the story is full of mercilessness, here is another example,
<em>"I continued working. I could hear him pulling at the chain, shaking  it wildly. Only a few stones remained to put in their place.  “Montresor! Ha-ha. This is a very good joke, indeed"</em>
This partial and unbalanced view point creates suspense in reader to know what would happen next.