How to tell if someone received and read my text messages?

So I have an iPhone 4 and Verizon #G is my carrier so I'm wondering how can I tell if someone has received and read my text. Mostly everyone gets my texts but there's rare occasions when they don't(specifically one person but i don't know what phone and carrier they have).Is there a certain setting on my iPhone that I can use or do I just sit, wait, and hope that they are just slow repliers? I hate sending the same thing or a message twice because I hate seeming annoying and desperate. I'm texting this girl who is really beautiful and she has a tendency to be a slow texter but she didn't get my first text but that was fixed. I texted her early this morning after our convo.last night and she hasn't replied yet, but I know she's on Facebook but I don't wanna pester and look desperate:/

It should say deliver underneath your text n then it will say received after they open it

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