Happy to have you watching CNN STUDENT NEWS.

I'm Carl Azuz.

We've got a lot of ground to cover today, starting inAfghanistan.

The U.S. has more than 33,000 troops there, supporting the military mission that began in2001.

Many of those troops will be coming home this year.

The question is, will some stay to train Afghan troops and help them fight terrorists?

The U.S. wants Afghan president Hamid Karzai to sign an agreement about this.

Because he hasn't, President Obama is threatening to pull all U.S. troops out of Afghanistanby the end of December.

Why this is happening?

It's because the U.S. says it's really running out of patience with Karzai.

He's indicated he won't sign that security agreement that would be the legal framework fortroops to stay there after the end of 2014.

With no agreement, U.S. troops would have to go.

They can't get him to sign, so President Obama publicly now saying plan for a full troopwithdrawal.

A government official from Pakistan says that would be a mistake.

He says, without some U.S. troops in Afghanistan, the country would have a civil war.

Time for "The Shoutout."

What's the only South American country whose official language is Portuguese?

If you think you know it, shout it out!

Is it Argentina, Portugal, Brazil or Guyana?

There are several world nations whose official language is Portuguese.

But the only one in South America is Brazil.

That's your answer and that's your "Shoutout."

Favela is a Portuguese word dating back to the 1940s.

It translates to shantytown, or slum.

An event coming soon to Brazil could bring a lot of money to some of Rio de Janeiro favelas.

The FIFA World Cup, the biggest and most watched sporting event on the planet takes off onJune 12.

It will play out in Brazil over a month, and as the supply goes down for places where can stay,demand goes up as do prices and opportunities.