The teen years can be quite challenging for kids and parents alike.

In large part, he added, this is because schools are more challenging for students.

We knew this stretch was going to be very challenging for us.

Ladies and Gentlemen, these are challenging times for the world.

We're surprised he didn't try something more challenging for his debut.

The next two and a half years proved to be the most challenging for the band.

More challenging for the visitor to find is the spirit of the place.

That is more challenging than it sounds, for a few reasons.

The hike is a little too challenging for small kids, though.

It has been a challenging and rewarding six months for us all.