Cannot is formal, while can't in informal.
"Cannot" and "can not" are interchangeable, but when you are asking question for example:
"why can't I...", you can also say "why can I not..." (which is more formal), but you can't say "why cannot I..."
        
             
        
        
        
The use is who is speaking wants to be heard and listened too.
        
                    
             
        
        
        
Answer:
the second one
Explanation:
it makes a little bit more sense 
 
        
             
        
        
        
The answer would be (3) simile
        
                    
             
        
        
        
Answer:
he should reduce the time he checks his phone and showers.
Explanation: