Pillow English Listening

◎◎◎ enigma ⪢⪢
An _____ is someone or something that is mysterious or hard to understand.
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○○○ enigma ⪢⪢
The theft of the painting is an _____ to the investigators.
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○○○ enigmatic ⪢⪢
However the exact process remains _____ .
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○○○ enigmatic ⪢⪢
From _____ pyramids that have puzzled scholars for centuries to forgotten cities buried beneath the sands of time.
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