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mystery
mastery/ˈmɪs.t(ə.)ɹi/noun
card 1 of 10 · fill in the blank
The disappearance of the ancient treasure remains a _____ mystery that archaeologists are still trying to solve.
card 1 of 10 · fill in the blank
The disappearance of the ancient treasure remains a _____ mystery that archaeologists are still trying to solve.