Challenges can virtually shut down a small campaign during critical weeks, and be extremely costly.

At that time, horses of good enough quality were both scarce and extremely costly.

But each of these efforts would be extremely costly and fraught with risk.

Treating these diseases is extremely costly for the Indian government and people.

"This has been extremely costly in terms of time, energy and money."

And it is also going to be extremely costly.

And some experts say they will find that extremely costly.

In very large nations, television and other forms of political communication are extremely costly.

Books only existed in manuscript form and, being extremely costly, were beyond the means of most people.

On the other hand, the proposed scheme is going to be extremely costly, both in terms of money and teachers' time.