All you need do is apply the 'filling in forms' editing restrictions. Once you do that the dropdown becomes active.

That said, if your other questions have dropdown content controls, you really should stick to one kind of control - formfields and content controls don't work well together. Unlike formfields, content controls don't require the 'filling in forms' editing restrictions to work. And, since you'll need macros for what you want to do, you could just as well use content controls throughout. In some respects, that would make coding for the conditional formatting simpler, too.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]