Last week, l had to work group with my friends. So everyone had any ideas to suggest. Finally, we could have saw the same point but excepted only one, she couldn't have agreed that made the argument next time. When the speech that we responded were fully anger and everyone began lost the reason. At last, we couldn't have done with the conclusion. So I peacefully asked she again "Why you can't accept ?". She was self-willed and couldn't have replied the good reason again and again. We would have kept clam but we can't at that time. Suddenly, I said "Shut up!" to her. I shouldn't have said it. I should have controlled my temper. So I think I should to apologize her.