3 Common Idioms in English. For practice, please use the idioms in sentences. I will correct them. 
1) Speak of the Devil -
Meaning: When someone you are talking about appears unexpectedly.
Ex. Did you hear about Alice's problems with - oh, speak of the devil, here she is.
2) Not a Ghost of a Chance -
Meaning: Almost no chance of success
Structure: not a ghost of a chance + of + doing something
Ex. Evan often arrives late to work and was very rude to his boss at the staff meeting. He doesn't have a ghost of a chance of getting a promotion.
3) Skeleton(s) in the Closet -
Meaning: hidden secret(s) from your past that you don't want other people to know about.
Ex: My aunt was in jail for 20 years. That is our family's skeleton in the closet.