1) When do we celebrate Christmas?
2) On which date does Christmas fall on?
Dice 1) When do we celebrate Christmas? Correct. Dice 2) On which date does Christmas fall on ?
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Dice1) When do we celebrate Christmas?
Correct.
Dice2) On which date does Christmas fall on?
Oops. You have 'on' twice. You'll have to remove one of them.
On which date does Christmas fall? < formal
Which