How to say in Czech: What are they allergic to?

English
What are allergic to?
Czech
Na co jsou alergičtí?
Are they allergic to anything?
They are allergic to dairy products.
They live there.
What is your address?
They didn’t write that.
They don’t know what to do anymore.
They just don’t know what to say.
What are they cooking?
What are they doing?
What are they doing this evening?

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