Although Martha Haskins never won a prize at a dance, she was proud of having been “a purty good stepper."

He switched on, put the groaning vehicle into gear, turned it round skilfully and sped dustily townwards.

The blame for starting the fire lies with the arsonist.

For convex cones, the concept of an extreme point is not of much use, since the origin would be the only candidate for an extreme point.