The murder remains a mystery. ✬

The mystery still remains unsolved. ✬

Has anybody solved this mystery? ✬

He had no difficulty explaining the mystery. ✬

What happened to them is still a mystery. ✬

Where the treasure is hidden is still a mystery. ✬

Many people never get it right and end up landing jobs in government. How they do it will forever remain a mystery. ✬

Life is a great mystery. ✬

What's your favorite mystery novel? ✬

Has anyone solved that mystery? ✬