He worked very long hours, but the __ was a higher salary than anyone else he knew. repay refund reward revenue

## Step 1<br />The problem is a fill-in-the-blank type of question where we need to choose the most appropriate word from the given options. The sentence is "He worked very long hours, but the __ was a higher salary than anyone else he knew."<br /><br />## Step 2<br />We need to understand the context of the sentence. The sentence talks about someone who worked very long hours and earned a higher salary than anyone else he knew. <br /><br />## Step 3<br />We need to choose a word that fits the context of the sentence. The word should be something that is related to earning or salary.<br /><br />## Step 4<br />Looking at the options, "repay" means to pay back, "refund" means to give back money, "reward" means something given in return for good behavior or good work, and "revenue" means money that is earned.<br /><br />## Step 5<br />From the context, it is clear that the sentence is talking about the money that he earned. So, the word "revenue" is the most appropriate choice as it refers to the money that is earned.