Fill in the blank with the correct preposition.
Take this medicine and get rid __________the fever.

of

The correct preposition to fill in the blank is of. The preposition of is used to indicate possession or relationship, or it can be used to indicate the removal of something. In this case, take this medicine and get rid of the fever, which means that the medicine will help you to get rid of the fever.

The other options are incorrect.

• Over can be used to indicate something that is being discussed or talked about, or it can be used to indicate movement or placement above something.
• At can be used to indicate something that is being discussed or talked about, or it can be used to indicate movement or placement near something.
• From is used to indicate movement or separation from something.