I will be in a marketing competiton soon.I want know how to greet you as a stanger in street. I indeed need help now. I mean the saying "Hellow" or "Hi" or "Excuse me" can make you feel more comfortble when you hear me using these to greet you ? Because I will join in a game . I should get some useful infotmation after showing our production to strangers as their answers are very important to me. And then should I use"Do you have a second?" or "Could you please spare me one minute?" to let you listen to me? I'm in trouble now. I really really need your help. Thank you very much!