Friends play a great role in our lives. They effect our lives negatifly or positifly. We should choose them very carefully. First, we can look at his behaviors. If it is OK, no problem but if it is not, we can't become a "Kanka". After that, we can look at his activities. It is very important to do something together. We must beware of people who has bad habits such as smoking, bad speaking, etc. Some people don't think so but I think finally we should look at his phsical aparians because if you have diffirent phsical aparianse than him, you can't be relaxable. For example if you are taller than him, this generally does unrelaxable to him. As a consequently, it is very important to choose a friend according to your especialities.