Select the most appropriate option to fill in the blank.

It is never advisable to have an axe to ________.

grind

It is never advisable to have an axe to grind.

Explanation:

• Kill: This option doesn't fit the context. The phrase "have an axe to kill" doesn't make sense in the given sentence.

• Rotate: This word means to turn or spin around an axis. It doesn't fit the context, as "have an axe to rotate" doesn't convey a meaningful idea.

• Replace: This word means to substitute or put something new in place of something old or broken. It doesn't fit the context of the idiom being used.

• Grind: This is the correct option. The phrase "have an axe to grind" is an idiom that means having a hidden motive or personal reason for something, especially in an argument or dispute.