OK so school started yesterday and this is my second year in Mechanical Engineering but the main problem with my campus compared to the other campuses is the our guy:girl ratio is about 105:1 (give or take) so slim pickins

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Today, I had 2 separate occasions where I could have at least number closed a girl but I had no idea how to open them!!
The first girl is a first year student (I didnt see her last year) and she was sitting in the caf alone at a fairly large table just nervously looking around. I was at the table next to her with some of my classmates and I caught her eye a few times but never a long duration. She would usually look away a few seconds after we made eye contact.
The second was on the bus home, we were on a really REALLY full bus and she was about 3 people away from me but we both could see each other clearly. And again, eye contact and thats it. She at least held eye contact for a few seconds but I was too far away to say anything, plus I had no idea how I would open her.
These "missed connections" happen to me quite a bit but these two really stumped me.
Any ideas on how I couldve handled either situation?
Thanks