Answer:
People call it the river of destruction.
Explanation:
When the subject is the performer of the action of the verb, it is called the active voice.
When the subject receives the action of the verb, it is called passive voice.
The given sentence is a sentence in passive voice. The subject in the sentence is unknown. When it is changed to the active voice, the general subject 'people' is added to it. The 'by-phrase' is missing in the sentence written in passive voice. The subject is the receiver of the action. The action of calling is done by the people. 
 
        
             
        
        
        
Answer:
The correct answer is:
2.Who
Explanation:
"It's not as much as what you know as who you know"
This could be considered a popular saying or idiom, in order to point about the importance in life to be well related. The group of friends in the different social fields of life such as education, work environment, hobbies, exercise among others, could be of great impact for the growing process in our lives, due to the fact that good connections from the known people could lead to great opportunities in life.