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 Introduction:Begin with impressive examples which describe gun cause big damage on people. End with a thesis statement 

Supporting idea

Thesis statement: gun is able to cause damage on many areas of life.

 #1 gun boosts the illegal behaviors such as robbery and murder.

#2 guns is potential danger on campus

#3 terrorists with guns might make big scare and damage on nation.   

Opposite idea

#1Thesis statement: gun can bring about considerable incomes for Gun Company and government.

Rebuttal:  response resulting from gun is far more that revenue from selling gun. 

#2thesis statement: gun is the most powerful tool to protect the life and property

Rebuttal: a. gun is the most powerful tool to damage the life and property.                  

                b. life and property tend to be safer without gun.  

Conclusion:  Admit some small merits of reducing gun control and conclude the ideas above