There is not a simple answer. It depends on the subject and level of students,of course.

VOA: special.2009.12.17

The disaster comes as Obama administration attempts to chart a course toward U.S.energy independence and less reliance on fossil fuels.

VOA: standard.2010.05.02

Okay, so the course thatthe tracker's on now is gonna lead him to a ballet studio?

VOA: standard.other

U.S.President Barack Obama has proposed a freeze on non-entitlement domestic spending, while awaiting recommendations from a bipartisan commission tasked with charting a course to a balanced federal budget.

VOA: standard.2010.04.21

At a recent driving event near Washington,D.C., teenage drivers tested their skills on a closely-monitored obstacle course to compare how they drove with - and without - distraction.

VOA: standard.2010.06.24

"For example,the woman's sector have put through a recommendation to cabinet around the idea of putting a moratorium on arrests of commercial sex workers during the course of the World Cup."

VOA: standard.2010.05.29

As for sightseeing, there's little time for that during their studies at the Olympics, but the students are welcome to stay for a bit on their own afterwards - if,of course, they are not worn out.

VOA: standard.2010.02.26

"President Zardari's troops are risking their lives courageously fighting extremists as we speak, a vital task which of course has had an impact on human beings and their local communities many of whom have been displaced as a result,"

VOA: standard.2009.05.13

Secretary Gates says he believes Iran wants to develop nuclear weapons and that the international community must keep it on "tight enough deadlines and specific enough requirements" to determine whether its government is seriously interested in taking a different course.

VOA: standard.2009.10.06

"We have to improve health care in general for everyday need and everyday purposes and if it does not work on an everyday basis of course in a crisis or in a disaster it is not going to suddenly work better,".

VOA: standard.2009.10.14

He gained several more hundredths of a second in the third run Saturday, so with a total lead of almost half a second, Holcomb just needed to steer a solid run on his fourth and final trip down the icy course.

VOA: standard.2010.02.28

"It is a double track approach,of course, to have a very clear position on sanctions, not only on Security Council, but specific new measures from the European Union on the financial side - on the oil and gas sector, in all elements that can give to Iran a very clear message that they have to move and respond to the requirements of the international community."

VOA: standard.2010.07.28