But his best has proved so far to be not good enough.

The location has so far proved successful to the company.

Staying with it has so far proved anything but difficult.

But it has so far proved most effective in reverse.

Of 6,000 diagnosed cases since 1986, only 15 have so far proved fatal.

Becoming smaller has so far proved to be more profitable.

None dropped in, further proving to him that golf was not his game.

However, the task of getting all relevant authorities to agree on a plan has so far proved difficult.

But the issue of the developing countries' future role has proved intractable so far.

The race for mayor has proved so far to be one of the more entertaining political stories in France.