Thanks everybody, I have been worked as a controller for 3 years , I know it is not long enough compared with you ,but I have found that I begin to lose the patient and passion with this job , at first I was trying to speak well to the pilots no matter how rude they are even if they shouted at me! But now , I do not know why ,I am easy to become anger with pilots ,especially the kind of pilots that speak lazily even if I never delay them ,their voice is just like they are gonna die or have not waken up yet !!! Or some heavy jet pilots ,they think they are good enough because they are big jet pilots ,so if they request something and it is not approved or if you make a maneuver to them ,they always say a lot ,that really made me mad sometimes !!!!