Complete with the correct modal. If you have a fever, you __ rest and drink plenty of fluids. musn't should ) can't don't

## Step 1<br />The problem is a fill-in-the-blank question that tests the understanding of modal verbs in English. Modal verbs are auxiliary verbs that express necessity, possibility, permission, or ability. In this case, the sentence is giving advice on what to do when you have a fever.<br />## Step 2<br />The sentence is "If you have a fever, you __ rest and drink plenty of fluids." The blank needs to be filled with a modal verb that expresses advice or recommendation.<br />## Step 3<br />The options are "musn't", "should", "can't", and "don't". The correct modal verb that fits the context of the sentence is "should". The sentence then reads "If you have a fever, you should rest and drink plenty of fluids."<br />## Step 4<br />The other options do not fit the context of the sentence. "Musn't" and "can't" express prohibition or inability, and "don't" expresses negation. None of these modal verbs express advice or recommendation, which is what the sentence is trying to convey.