actually most people don't say anything at all to each other in the morning.
I used to say "Good Morning" to everybody, but I stopped sayig that to women. Because, I was always taught to speak when spoken to, and to greet people. But, women today see that as a sign of weakness, so I wait for them to speak...I did a experiment at work...
When I would come into work, there was a woman,that I would greet, she would say nothing---but, when I said nothing she would speak---thus, garnering attention for herself...this was replayed with other women as well. Men, will speak, and greet each other...