They got into their car and were out of sight in three minutes.
My heart leaped with an enormous relief, but I went on wheeling my stones.

It was as well, for ten minutes later the car returned, one of the occupants waving a hand to me.

Those gentry left nothing to chance.
I finished Turnbull's bread and cheese, and pretty soon I had finished the stones.

The next step was what puzzled me.

I could not keep up this roadmaking business for long.