Another word for proving

The only thing she had been proving lately was that she could successfully avoid him.

How could he betray her trust so utterly - for the sole purpose of proving a point to Claudette?

Proving their accuracy is up to the authorities.

Frisch began the long series of works on the birds of Germany with which the literature of ornithology is enriched, by his Vorstellung der Vogel Teutschlands, which was only completed in 1763, and, its coloured plates proving very attractive, was again issued at Berlin in 1817.

Remains of spiders from the Baltic amber beds of Oligocene age and from nearly coeval fluviatile or lacustrine deposits of North America belong to forms identical with or closely related to existing genera, thus proving the great antiquity of our present spider fauna.