Select the most appropriate option to fill in the blank.

After a tiring day, the workers decided to ____________ to restore their energy.

hit the sack

The most appropriate option to fill in the blank is hit the sack.

• Have an axe to grind means to have a personal agenda or to be biased. It does not make sense in the context of the sentence because the workers are not trying to achieve anything specific by going to bed.
• Put a spoke in the wheel means to hinder or obstruct someone's plans. It does not make sense in the context of the sentence because the workers are not trying to prevent anyone from doing anything by going to bed.
• Bring to book means to make someone accountable for their actions. It does not make sense in the context of the sentence because the workers are not trying to punish anyone by going to bed.
• Hit the sack is a slang phrase that means to go to bed. It is the most appropriate word to fill in the blank because it describes the workers' intention to rest and restore their energy.