Which sentence is punctuated correctly?

Which sentence uses commas correctly?

post / pohst/ noun 1. a strong piece of timber or metal used to support or hold something 2. a military base with permanent buildings 3. the station where a person is located while on duty such as a soldier or nurse 4. a person who traveled express, especially over a fixed route, carrying mail, currency, etc.

Paragraph: The officer was on duty at the high school basketball game and he received a call from his boss at the police station. Evidently, they were busy, and the officer needed to return to his post at the station.

Which is the best definition of the word post as it is used in this paragraph?

hold (hohld) verb 1. to grasp 2. to set aside 3. to have a belief 4. to keep from doing something

Sentence: The department store told her they would hold her new dress for three days if she couldn’t pick it up right away.

Which is the best definition of the word hold as it is used in the sentence above?

track (trak) noun 1. a path made by people or animals 2. a course or route followed 3. parallel lines of rails for railroads 4. a footprint made by people or animals

Emily was upset at her father and decided to walk to school. She took a shortcut her friend had told her about. Even though she had to cut through the wooded area, it didn’t bother her because she could see the track all the kids had made and just followed it.

Which is the best definition of the word track as it is used in this paragraph?

Kendra wrote this sentence for her essay.

The streets in our city used to be very clean, but they are not clean anymore.

Kendra looked up the word clean in a thesaurus and found this entry.

clean (kleen) adjective 1. pure, orderly, spotless 2. even, regular 3. thorough, complete 4. honest, fair

In the sentence, Kendra wants to replace clean with a synonym. Which word should she use?