Would these be good conversational openers?

I'm not that good at opening with girls and I just wanted to know if these would be good converrsational openers. If they suck, don't be afraid to say so, maybe give me a few good conversational openers.

"Hey I saw you after school yesterday."

"What did you over the weekend?"

"So, what do you think of the weather?/Nice weather today, huh?"

"What are you studying?"

"What did you do yesterday?"

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This is the crowded room >>37 >>39 is talking about

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