Breakfast is provided at no extra charge.

供应早餐，不另收费。

An extra charge may be made for providing special food.

如需提供特殊食物，将会收取额外费用。

Sorry for the extra charge.

抱歉，向您多收费了。

Is there any extra charge?

有没有其他额外费用？

I can guarantee you no extra charge.

我可以保证决不加收费用。