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Gases will probably be in a lot of the examples where work is being done because the work done by liquid and solids in a system is generally insignificant. However, they could definitely ask questions about solids and liquids in a closed system where the energy of the system is changed by heating/cooling rather than doing work.
If it's a work problem, we're probably going to be dealing with gases. Heat problems, however, can have things in basically any state. There's a ton of homework problems, for example, that involve heating a piece of solid metal.
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