puzzle - (noun) something that is difficult to understand or explain., baffle - (verb) to confuse somebody, remote - (adj) far away places where other people live, extraordinary - (adj) unexpected, surprising, or strange, trace - (noun) a mark, object, or sign, that shows that somebody or something existed or was present., solve - (verb) to find the correct answer or explanation for something,

1B - It's a mystery - ex 1d EF Upper Intermediate

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