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

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

Even the idea of us as a family was challenging to most people.

They attract the strongest principals into the toughest schools, and the most talented teachers into the most challenging classroom.

PM What's the best part of working with your mother, and the most challenging part for you?

The accomplishment of civic virtue is tied to the uses of intellect and imagination at their most challenging.

Beyond coordination, the requirement to build sustainable capacity is one of the most significant issues challenging technical cooperation activities.

Reform of the security sector has therefore been one of the most important and challenging items on the institutional agenda.

The deployment and use of this seismic network is considered one of the most challenging aspects of the Don Quijote mission.

That was challenging.

There are many where this paradigm can now play, but I think probably one of the most challenging things is on the softer side.

The Secretary General has described the response to the South Asian earthquake as the most challenging relief operation ever faced by the United Nations.

This is challenging work to do.

It's not very challenging any more.

The large countries in this part of the Islamic world most notably Egypt, Pakistan, and Turkey are attempting to address four problems, the most challenging of which is to define Islam s role in the political system.

Skepticism, because you must always be 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.

Efforts by KPC to fulfil the most challenging element of the standard recruitment and retention of minority community members have been hampered by pressure on interested Kosovo Serbs from their own communities.

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.

But perhaps the most challenging part was to convince the regulators a matter which was debated in the parliament that a young female surgeon be allowed the opportunity to pioneer for her country.

Every effort should be made by all States parties to contribute actively to building the knowledge base that will be conducive to the ability of the Conference to perform its most challenging functions.

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 was seeking to create a world class, flexible and effective security service, composed of a geographically representative team of outstanding security professionals and capable of enhanced field support in the most challenging environments.

Perhaps the most challenging issue that has not been considered quantitatively so far is surmounting the difficulty of disentangling the uses of NTBs that are discriminatory from those that are defensible (on legal grounds).