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

VOA: special.2009.12.17

This might be a greater magnitude and level of corruption, because of drug cartels.

VOA: standard.2009.12.18

"On the Internet, the other side is trying to exploit people's feelings, and they give them instructions on how to do wrong things and we have to give (them) tools and manuals also on how to stay cool and level-headed and stay reasoned and don't get yourself and others in trouble,".

VOA: standard.2009.12.20

Secretary Clinton said donors and the government of Haiti showed a new level of international support, coordination and cooperation.

VOA: special.2010.04.02

Experts say the ability to take up lead is reduced when the pH level is above six and a half.

VOA: special.2009.06.09

They have a material that supplies electrons and a power source that lifts the energy level of those electrons.

VOA: special.2010.09.01

They answered questions about their level of physical activity as teenagers and at age thirty, fifty and late in life.

VOA: special.2010.07.07

Others said that he was chosen for his communications skills and educational level and because he was an established sports star.

VOA: special.2009.04.05

She says that Earth Day is still very much about activism and fighting for the environment on a local level.

VOA: special.2010.04.21

One sports writer later described Clemente's throwing, running and hitting during the World Series as close to the level of perfection.

VOA: special.2010.04.11

Dr.Chan says the WHO is no longer operating "at the level of top performance that is increasingly needed,and expected."

VOA: special.2011.01.19

On a passenger cruise ship, fresh air is available on decks and in other places above sea level.

VOA: special.2009.07.14

Bob McDonnell said Democrats are spending too much and creating a level of debt that cannot be supported.

VOA: special.2010.01.30

He says that teenagers should set the volume control on their music players to somewhere between one-half and two-thirds the highest level,never louder.

VOA: special.2010.09.28