Their are lots of methods on being astute (:
 
        
                    
             
        
        
        
Answer:
I Didn’t Understand the Homework
This excuse works better for science, maths or questions-based homework rather than essays. That doesn't mean it won't fly if the assignment called for you to write at length; you might simply explain how you didn't quite get the idea of what you were supposed to write about.
This excuse hits two birds with one stone when you combine it with 'could you explain it to me?' because you'll get help with your homework and a deadline extension, especially if you actually don’t understand the homework assignment.
Beware of this pitfall: Teacher might ask if you talked with any of your classmates to see if they could explain what you were supposed to do. You might say that you asked your parents or an older sibling for help but avoid mentioning any mate your teacher might know, just in case s/he tries to verify your story.
Explanation:
have a great day!
 
        
             
        
        
        
Answer:
He describes two general media channels of communication: mass media and interpersonal; and two scopes of channels: localite and cosmopolite.
Explanation:
 
        
             
        
        
        
Answer:
I was so late this morning. By the time I got to work, I missed the whole meeting.
Explanation:
The sentences are in past tense, so you need to change those words to past tense. 
I was so late this morning. By the time I ...........(get) to work, I.........(miss) the whole meeting
Past tense of get is got and past tense of miss is missed.
I was so late this morning. By the time I got to work, I missed the whole meeting
 
        
             
        
        
        
 The use of speech to exchange of informal ideas, information etc.
- dictionary