What do you do when you've run out of things to say?

I've been dating this girl for a little while, and now I feel like I've run out of conversation topics to talk about. I feel like I've already asked everything i can possibly ask. Because she's shy and I'm the one that comes up with the great ideas and topics, the conversations are getting dead now that I have nothing to say. What do I do now, beyond asking the regular stuff like "how was your day?"
What do you do when you've run out of things to say?
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