He was asked to proxy for someone during the attendance check in class.

I looked for a cheap hotel to save on the cost of accommodation for my trip.

I looked for a cheap hotel to save on accommodation costs.

She is learning how to use pronouns.

I forgot to pay the bus fare.

The train fare is high, making my monthly expenses tough.

Who wrote this draft?

I will turn twenty years old next year.

Our project is scheduled to be completed on the twentieth day of the month.

She said 'to each his own', respecting the differences among people.