Idiom Practice 7

This idioms quiz offers 10 sentences, each waiting for the one word that finishes a familiar saying.

You could fill in It all became public when she ___ the whistle. or When the fire started, she was the first one to step up to the ___. strengthening your grip on conversational English.

A nice image lies behind one phrase: when something happens out of the blue, the blue is a clear blue sky, so the expression compares a sudden surprise to a bolt of lightning striking from a cloudless day.

Recommended level: intermediate.