What is a common sense?

　In my opinion, common sense is not special knowledge. Most of
　
people have a common sense. For example, if you borrow
　
dictionary to your best friend, but he or she lose it. Then....what
　
should you do? you have to tell him or her "You have to buy same
　
thing !" You have a right to request even if your best friend.
　
I think that is common sense. We will be know that is a wise way
　
to solve the problem. A common sense is kind of knowledge,
　
because you have to think for search a solution, but it is easy to
　
find. A common sense is naturally thinking come out your brain.
　
If you don't know how to solve the problem, think a common
　
sense. Then you can solve the problem easily!