Both are fine. You can also say
"Something fell out (or 'tumbled out') of (or 'from') the book."
"Something fell out from amongst the pages" (sounds old fashioned, but I like it).
2023年11月21日
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I would suggest:
Something fell out from between the pages.
2023年11月20日
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招待者
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Which "one" is OK
Either is fine. The 2nd one is more formal/more old English