A single color, since mono means one or single.
        
                    
             
        
        
        
Answer: the outer limits or edge of an area or objects
Explanation:i just know from the top of my head.
 
        
                    
             
        
        
        
Answer:
politics will always have vast amounts of material and comes with the bonus of removing you from half of your friends. Try politics. Start with government involvement in free-market economies. 
 
        
                    
             
        
        
        
The last one "he makes a wish of eternal youth without considering the consequences of his actions" is ended with a question mark but it isn't phrased as a question and should be ended by a period instead. The fourth sentence is the correct answer.
        
             
        
        
        
No a teacher cannot be subordinate to his students.
Explanation:
In a school a teacher and a student should have a cordial relationship. A student should respect a teacher and a teacher should respect a student. A teacher is the head of the class as he has come to share knowledge with the students as well as a teacher will help in developing the critical thinking skills in  students. 
A teacher has the power of marks in his hands and should exercise his power properly. In the same way it is the duty of the students to follow the instructions of the teachers properly and pay attention in the class , so that other students are not disturbed.