Mildred is worried about being caught with books because they are against the law. She doesn't want her house burned down and sees Montag's actions as foolhardy. These actions show Mildred as a law abiding citizen who conforms to the dictates of the law
Answer : The sentence correctly uses the word sordid is:
_ The girl found all of the sordid tasks of cleaning to be uninteresting and menial.
