These are difficult questions to answer, and there is little evidence available from the past to help.

Real science takes time, and there are always more questions to answer.

A. That's a very difficult question to answer without seeing the person.

For much of its history, those have been easy questions to answer.

For many students, it is not an easy question to answer.

The only question to answer was exactly what to buy.

"We have some serious questions to answer to the American people."

In a way, this an easy question to answer: Do parents matter?

But when one comes home, there are always questions to answer.

This was a very difficult question to answer in the case of television, for example.