Choose an idiom to replace the expression in the brackets: Please stop that (mischief) and do some serious work.

To solve this question, the user needs to have a good understanding of idiomatic expressions and their meanings.

The expression "(mischief)" indicates that the person is engaging in some kind of playful or mischievous behavior instead of doing serious work.

Let's go through each option and explain why it is right or wrong:

A. dog and pony show: This idiom refers to an elaborate performance or display, often used to impress or entertain others. It does not fit the context of the sentence, which is about someone not doing serious work.

B. monkey business: This idiom means dishonest or shady dealings, or foolish or playful behavior. This fits the context of the sentence, as the speaker is asking the person to stop engaging in playful behavior and focus on serious work.

C. piggyback: This idiom means to carry or transport someone or something on one's back or shoulders. It does not fit the context of the sentence, which is about someone's behavior.

D. road hog: This idiom refers to someone who drives recklessly or selfishly, taking up more than their fair share of the road. It does not fit the context of the sentence, which is about someone's behavior in the context of work.

Therefore, the correct answer is:

The Answer is: B. monkey business