Is the question "What's one cause that is dear to your heart?" used commonly?
No, this question in itself is not used very commonly. It would be more common to ask, "what's something you really care about?" instead. However, the expression "dear to someone's heart" can be used more commonly to express a deep care, love, or a passion for something. Ex: Those children are not my own but they are dear to my heart. Ex: I want to adopt a dog at the shelter because abandoned dogs are dear to my heart.
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