Dialogs with Idiomatic Expressions

On many TOEFL exams, especially in present day, up to half of the dialogs in Part A contain idiomatic expressions.

You will hear:

F1: I wonder where Mike is.
M1: He'll show up as soon as the work is done, I bet.

You will read:

  1. He probably won't arrive until the work is finished. 
  2. He went to a show instead of going to work. 
  3. He can show them how to do the work.
  4. He'll probably work late today. 

The idiom/phrasal verb show up means "arrive".
Choices B and C contain the word show; but it is not used in the idiomatic sense. 

In most dialogs, the second speaker uses the idiomatic expression. Most questions about this type of dialog are questions about meaning "what does the man mean" for example, so that helps you some. However, some could be inference. Incorrect choices often contain references to the literal meaning of idioms. 

And to be clear, memorizing all these idioms will not guarantee that you will hear them, if any, on the listening comprehension. There are, after all, thousands of these expressions in English. 
13 Lessons