Quand La Premiere Guerre Mondial a-t-elle commence. This seems an awkward construction, but perhaps not. Could one say: La premiere Guerre Mondial quand a-t-elle commence? Please excuse the lack of punctuation.
What we are suggesting is the 'proper' way of building such a sentence, but in everyday speech, your version is very acceptable.
You could also say very very collaquially -
Bonne Continuation !
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