Get on the bus one by one .

Which book is older, this one or that one?

Please line up one by one.

Please come into the room one by one .

As one grows old, one becomes a light sleeper.

When one would be filial, one's parents are gone.

One of my favorite hobbies is reading, another one is painting.

I prefer one-to-one conversations over group discussions.

One is more prone to make mistakes when one is tired.

One's success in life has little to do with one's inborn gift.