Teaching in role is a strategy which a great many teachers have found extremely useful.

Data which is Personal, sensitive, and extremely useful, or at least it could be.

This is going to be extremely useful information when we get back home.

The information Paul provided turned out to be extremely useful.

It is not only excellent in quality but also extremely useful.

It would be extremely useful for many people in Europe to know what is being done.

First of all, I have to say that experts are extremely useful.

This report is an extremely useful reminder, which comes at just the right time.

This is extremely useful, and we should all make use of it.

Then we can look forward to some extremely useful work on a subject of growing public concern.