Since then, scientists around the world have been working to identify substances gathered from Comet Wild-Two.

VOA: special.2009.09.30

Since then officials have been reported working on final guidelines for when schools should close.

VOA: special.2009.08.05

Walter Schmidt has been working to find uses for chicken feathers since the nineteen nineties.

VOA: special.2010.06.01

"Since China and America are working so closely and our relationship is growing more and more, I think it will be very important in the future to know Chinese."

VOA: special.2010.02.04

Tessionniere claims that since it could not fire many workers, France Telecom created miserable working conditions to force them to leave.

VOA: standard.2010.04.11

"Since 2004 we have been working closely with international agencies to gather intelligence to overcome any potential terrorism act."

VOA: standard.2010.06.02

That is a question Rwanda's judiciary system has been working to answer since Laurent Nkunda's arrest in January.

VOA: standard.2009.04.18

Since late last year, many factory owners have cut working hours and pay by 25 percent.

VOA: standard.2009.03.09

Critics say the national exam is biased, since it presumes a level of knowledge and cultural background that students from working class families may not have.

VOA: standard.2010.02.02

Ever since then Rwanda has been working to achieve some sense of justice.

VOA: standard.2009.04.10

Ghana's Energy Commission has been working on a biofuels policy since 2005.

VOA: standard.2009.08.23

Since 2003,the U.S.Agency for International Development has been working with the Malian League of Imams and Scholars on an Imam Outreach program to include prevention messages in Friday sermons.

VOA: standard.2009.10.21