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You want to know something? I don't think Mozart's going to help at all.
If I turn over a tile and I can place it, must I place it?
This question has come up before, and the English rules don't explicit answer it.
For example, my number line has 40 then BLANK then 50 and I turn up 42. Must I take it, or could I leave the 42 face-up in the center?
(I'm pretty sure there's no reason why you wouldn't want to take it, but just for clarification.)
No, you do not need to place the tile, even if you can place it.
This is indeed not specifically stated in the rules, since not placing a tile (even if you can) is not recommendable. You will usually have a disadvantage by doing so.
However, since it is not explicitly forbidden, you can certainly do so.