Though this question you have to do on your own its based off of your opinion,
though when making the question be sure they are not yes/no questions
 
        
             
        
        
        
Answer:
I don't believe you would be marked down for not including it. 
Explanation:
<u>However, you still could include it just to show your teacher that you really did extensive research on the topic rather than using your own opinion.</u>
 
        
             
        
        
        
Ordinary or nonmagical people were called "muggles".
        
                    
             
        
        
        
Answer:
6) Adresses
7) Knives.
8) Rooves.
9) Canopies.
10) Mooses.
11) Piani.
12) Handsful and/or Handfuls.
13) Calves.
14) Series.
15) Crises
16) Plural.
17) Plural.
18) Singular.
19) Singular.
20) Plural and Singular.
21) Singular.
22) Plural.
23) Singular and Plural.
24) Singular and Plural.
25) Plural.
 - Hope I helped :)