请给我一张去伦敦的单程票，好吗？

Could I have a ___single to London, please?

我需要买一张明天去格拉斯哥的单程票。

I need to buy a ___single to Glasgow for tomorrow.

去牛津的单程票价格已经上涨了。

The price of a ___single to Oxford has increased.