You might have to stay away from low-lying areas for as long as twenty hours after the first warning.

VOA: special.2011.06.07

Disease-control experts from the United States confirmed the first cases of cholera in Haiti on October twenty-first in the Artibonite area.

VOA: special.2010.11.10

He says a new system is needed to meet the speed and complexity of a twenty-first century global economy.

VOA: special.2009.06.19

Michael Johnston is twenty-seven. He was first deployed to Iraq in two thousand three at the beginning of Operation Iraqi Freedom.

VOA: special.2011.07.08

On May twenty-ninth, nineteen fifty-three, Edmund Hillary and Tenzing Norgay became the first climbers known to reach the summit of Everest.

VOA: special.2010.06.30

On June twenty-sixth, the first C-47s landed at Tempelhof Airport - the beginning of the great operation that was to come.

VOA: special.2011.08.11

In one area was a blank canvas that had been waiting twenty-five years for the first line of paint.

VOA: special.2009.08.01

Professor Burgess says the first ten years of the twenty-first century are expected to register the most attacks of any ten-year period.

VOA: special.2009.06.16

The international malaria community has set the end of twenty-ten as its target for meeting the first in a series of goals.

VOA: special.2010.04.20

The hard work of this grassroots effort resulted in the first Earth Day on April twenty-second, nineteen seventy.

VOA: special.2010.04.21

Its president,Anne Neal, says these areas of knowledge are needed to succeed in a twenty-first century society and an increasingly connected world.

VOA: special.2009.10.22

The first ship carrying the gold seekers arrived in the port town of Skagway,Alaska, on July twenty-sixth,eighteen ninety-seven.

VOA: special.2009.02.11

On September twenty-first, a team called BellKor's Pragmatic Chaos was named the winner of the Netflix Prize.

VOA: special.2009.09.25

The first Rockwell work Spielberg ever bought is a nineteen twenty-two painting called "And Daniel Boone Comes to Life on the Underwood Portable."

VOA: special.2010.09.20

That was when twenty-five students in a class taught by Thomas Zurbuchen first talked about the idea.

VOA: special.2009.02.16

Girls are advised to begin testing within three years of when they first have sex, or in any case no later than twenty-one.

VOA: special.2009.11.25

But this next Rock and Roll Hall of Famer is scheduled to perform on October twenty-ninth during the first of two nights of concerts.

VOA: special.2009.10.19

Twenty-two-year-old First Class Midshipman Laura Martindale will graduate next Friday from the Naval Academy in Annapolis,Maryland.

VOA: special.2010.05.21

He was the first Democratic Party candidate to win a presidential election in almost twenty-eight years.

VOA: special.2010.05.06

Well,first of all, the twenty-second and twenty-fourth presidents of the United States were the same person.

VOA: special.2009.07.24

George Gershwin had his first big hit in nineteen nineteen, when he was twenty-one years old.

VOA: special.2009.02.08