#1 won't work. Room X is so expensive. -- As a stand-alone sentence, that's okay, to mean it was very expensive.
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northwindThe background is yellow and my post appears in two places though I posted only oneThat's because you clicked "Verify answer", whether accidentally or purposely, to show you thought it was the best answer in the thread! (I put it back where it was because it seems you didn't intend to do that.)