Read only problem on forms

I'm having a problem when I set fields to read only in ApEx. The situation is there are several surveys to have user's fill out and they don't need to answer every question, and once the surveys are submitted, they are no longer able to be modified. I had no problems setting the fields to read only in that case, but the problem I'm encountering is that any question that had a null value left in it instead of being answered, the field is displaying as: []. I'd like to be able to change that so that it reads as not answered or something to make it more readable.
Is there a way to use a case when expression to clear this up? Thank you.

Thanks for the quick response.
I tried giving a case when using the null on one of the questions then set the form into Read Only mode, and it still displayed as []. I forgot to mention this part last time, and I'm sorry about that, but these items are Select Lists with a NUMBER column in the database, so I can't actually store words in the table for the null vales.

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