How to punctuate this? 'Do you know..."

Hi

Could you please punctuate this for me? The sentence starts with a question but does not end with it! :shock:

Many thanks

Tom

PS: Are “a” and “an” required there?

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The best idea is to break it up, Tom:

Do you know that there are many names for a television? Perhaps the most pejorative of all is ‘the idiot box’.

The article before ‘television’ because the allusion is to the appliance and not to the medium; the article before ‘idiot box’ because it is giving the appliance a name.
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