◎◎◎ enigma ⪢⪢
An _____ is someone or something that is mysterious or hard to understand.
29033#12373 SIBLINGS CHILDREN 12373

○○○ enigma ⪢⪢
The theft of the painting is an _____ to the investigators.
29033#18718 SIBLINGS CHILDREN 18718

Pillow English Listening

○○○ enigmatic ⪢⪢
However the exact process remains _____ .
29033#27969 SIBLINGS CHILDREN 27969

○○○ enigmatic ⪢⪢
From _____ pyramids that have puzzled scholars for centuries to forgotten cities buried beneath the sands of time.
29033#27765 SIBLINGS CHILDREN 27765