<p><span style="">The sentence structure in the given sentence indicates a conditional clause. The word "______" is a placeholder for the correct conditional word that needs to be inserted.</span><br></p>
<p>The correct conditional word in this sentence is "Should". The word "Should" is used to express a possible outcome or condition that may occur in the future.</p>
<p>The sentence is saying that if your application is denied, there is a possibility that it may happen, then you will receive a full refund of the application fee.</p>
<p>Example: Should it rain tomorrow, we will stay indoors.</p>
<p>In this example, "Should it rain tomorrow" expresses the condition that if it rains, then the outcome will be that we will stay indoors.</p>
<p>Therefore, the correct word to fill in the blank is "Should".</p>