Yet that is where its effects are best known, especially at the high school level.

VOA: special.2010.03.04

But Marc Tucker says students who pass the exams could stay in high school and take a demanding set of exams at the upper division level.

VOA: special.2010.02.25

Afghan President Hamid Karzai and Pakistani President Asif Ali Zardari flew into Tehran, at the head of high-level delegations, to discuss a series of problems, including drugs, terrorism and Islamic extremism.

VOA: standard.2009.05.24

But he says this one stands out. "This is a very unusual attack in as much as it appears to be a successful attack upon the Revolutionary Guards at such a high level involving so many of the senior officers,".

VOA: standard.2009.10.18

But the U.S.reaction to Thursday's attack was at an unusually high level, with both President Obama and Secretary of State Hillary Clinton issuing written statements expressing sympathy to the families of victims and calling for the attackers to be held accountable.

VOA: standard.2010.07.16