1.   Children follow the same pattern of physical development but each one at a different pace.

2.   Down below, two points of red light appear, one at a time like a wink in reverse.

3.   Each small protuberance seems to be attached to a larger one at some minute place, producing many warts upon warts.

4.   From the one at the back was a fine view across the City to Harnham Hill and the Raceplain beyond.

5.   He has sold no less than five cars, each one at a tidy profit.

6.   How about a quick one at the pub?

7.   I was always the odd one out at school.

8.   In each case contestants are voted out one at a time by their colleagues and by viewers until just two are left.

9.   In which free-lance warriors are selected one at a time to carry out a dangerous mission.