Even if we do achieve victory there, the cost has proved very high.

In addition, the costs of managing large systems have proved to be high.

It had been abandoned when the cost proved far too great.

Some analysts believe the actual cost will prove much to be higher.

At the time, the cost of developing the gas field proved prohibitive.

The costs of leaving girls out of school have already proved to be high, researchers say.

However, mortgage and other costs proved an enormous financial strain on the company.

Some economists, though, fear that the costs of supporting the elderly will prove too much for future workers.

Unfortunately its cost proved unacceptable and so a more affordable design was started.

The cost of constructing the building proved greater than expected.