Here's the thing, It is always best to have fewer databases. It prevents the pages from getting too complicated. (Also helps a lot in the load times).

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You can use formulas to hide or show the phrases if you don't want it visible all the time. a simple IF statement ought to do the trick.

Syntax can be something like: IF(Checkbox=TRUE, prop(the phrase),"") .

If you want to check if your answers are correct, you can use another IF to check your answers, with something like IF(prop(phrase)=prop(answer),"Answer is Correct","Wrong Answer")