This can be interpreted from either First or Second person depending on the context but I'd say your best bet is First person. Hope this helped!
        
                    
             
        
        
        
Answer:
future perfect is the correct tense
 
        
                    
             
        
        
        
Answer:
That they have done so for their own sake
Explanation:
 
        
             
        
        
        
Answer:
The correct choice is option B. the teacher’s annoyed expression and crossed arms.
Explanation:
I hope this helps you :)