Hi, <br/><br/><b>Question:</b><br/>Which sentences are correct?<br/><br/>Which sentence is the best?<br/><br/><br/><b>Sentence1:</b><br/><br/><span style="color:rgb(0,0,255);"><b>While</b></span> I was in the US, I submitted my resumé for the graduate trainee position on 21st February.<br/><b>Sentence2:</b><br/><br/><span style="color:rgb(0,0,255);"><b>When </b></span>I was in the US, I submitted my resumé for the graduate trainee position on 21st February.<br/><b>Sentence3:</b><br/><br/>I submitted my resumé for the graduate trainee position on 21st February, <span style="color:rgb(0,0,255);"><b>while</b></span> I was in the US.<br/><b>Sentence4:</b><br/><br/>I submitted my resumé for the graduate trainee position on 21st February, <b><span style="color:rgb(0,0,255);">when </span></b>I was in the US.<br/><br/>Thanks