Selecting from the given alternatives, fill in the blank in the following sentence with the correct idiom which means 'somebody who although looks harmless is really very dangerous'.
Do not provoke him unnecessarily. He is a ________.
Show answer & explanation
Correct answer: B
Explanation
The idiom "a wolf in sheep's clothing" is used to describe a person who appears to be friendly, harmless, or innocent on the outside but is actually dangerous, evil, or untrustworthy on the inside.
Sentence: "Do not provoke him unnecessarily. He is a wolf in sheep's clothing."