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Steve and Yaser first met in their chemistry class at an American university. Yaser was an internat...

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don’t recognize    hadn’t recognized    haven’t recognized    didn’t recognize  
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regretted    knew    realized    recognized  
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where    what   that    if  
don’t recognize , By the first time    hadn’t recognized, For the first time    haven’t recognized, First time    didn’t recognize, The first time  
it was when    was it when    was it that    it was that  
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