You know the uni is the most challenging, so number ten is challenging.

That was challenging.

This is challenging work to do.

It's not very challenging any more.

Skepticism, because you must always be challenging.

DM She's very tough it's most challenging.

It's this immensely exciting and challenging problem.

That is an assumption that needs challenging.

In Japan, they say that sushi is challenging.

BC EDL is this immense, technically challenging problem.

However, the situation in Cité Soleil remains challenging.

But deciphering the script is a very challenging task.

It's going to be very challenging to deal with.

The selection of indicators has proven to be challenging.

Women challenging these norms are punished by violent means.

We live in difficult and challenging economic times, of course.

They're challenging the very notion of Western models of development.

It's a very challenging task. But more to come later.

You can see the trapezoids are a little challenging there.

And we as Africans need to start challenging our leaders.

Everything we do, we believe in challenging the status quo.

We express our gratitude for Mr Smith's outstanding, challenging speech.

In this challenging environment, administrative infrastructures have continued to function.

This has been particularly challenging in remote and insecure areas.

These have indeed been very challenging times for our Organization.

Indeed, we live in both challenging as well as exciting times.

And there were two types of laws that were particularly challenging.

Determining an optimal level of accountability for results is also challenging.

Some individuals and entities have filed multiple lawsuits challenging their listing.

The motion challenging the expert report was therefore not taken up.

It takes 24 hours in a very highly developed laboratory, in highly skilled hands.

Shame is highly, highly correlated with addiction, depression, violence, aggression, bullying, suicide, eating disorders.

It's highly commercial.

They're highly imaginative.

Highly significant relationship.

He's highly intelligent.

And this is a very challenging idea. It's a very challenging idea to mainstream media. It's a very challenging idea to anyone who has invested an enormous amount of time and expertise, and who has a lot of energy invested in the notion that he or she knows better than everyone else.

At the best of times, traveling between Indonesia's many islands is challenging.

Managing such a large and complex peacekeeping mission was a challenging task.

Because it is fighting for its own survival in a highly challenging environment, the Jordanian regime needs Israel s security collaboration. Indeed, Israeli and Jordanian forces are now working together to secure their respective borders against infiltration by jihadists from Iraq or Syria, while Egypt and Israel now share the same objective in Sinai.

upon highly honored pages,

upon highly honored pages,

That is highly debatable.

It is highly dangerous.

So, really even challenging the notion of what can be considered a story.