Answer:
Completed thought
Explanation:
The sentence, "Flora flew a yellow kite" is a completed thought because it has a subject, a verb, contains a clause and ends with a punctuation mark which was a period in this case.
It is not a subject because a subject is the performer of the action in a sentence, and it is also not a verb because a verb is an action word, however, it contains a subject and a verb and contains a completed thought.
 
        
             
        
        
        
Answer:
However, he had laid a solid groundwork for others in their attempts to decipher the hieroglyphs.
Explanation:
 i had the same question on one of my test and my teacher already graded it 
 
        
                    
             
        
        
        
Answer:
Definitely formal English as formal English is used in formal settings. Both the examples you gave are formal settings. 
 
        
                    
             
        
        
        
Not one fish did the campers catch although they fished all day
        
             
        
        
        
Answer:
I think it will be very risky