Older equipment powered by fossil fuels should be inspected every year to make sure it continues to be safe.

VOA: special.2010.02.02

When crime scene investigators arrive at the place of a crime, they first try to make sure the area is secure.

VOA: special.2010.05.05

Experts say any device used to heat a home should be inspected to make sure it is working correctly.

VOA: special.2010.02.02

The scientist says this mission has been planned for many years, but he is not sure when it will happen.

VOA: special.2010.05.25

But Kurt Volker, former American ambassador to NATO, the North Atlantic Treaty Organization, is not so sure what will happen.

VOA: special.2010.07.24

They felt sure of success. For now,enough leaders of the Southern Alliance were willing to support the idea.

VOA: special.2010.06.10

They are also advised not to give anti-reflux medicines for hoarseness unless they are sure patients need them.

VOA: special.2009.09.02

Experts say the situation is likely to continue until investors feel more sure about signs of economic recovery.

VOA: special.2009.08.21

Michael J.Fox says he is sure that a cure for Parkinson's disease will be found in the future.

VOA: special.2009.04.07

But one thing is sure. The discoveries in the meteorite helped shape policy and exploration efforts at the United States space agency,NASA.

VOA: special.2010.07.28

He had a plan,he said. And he would not move until he was sure his men were ready.

VOA: special.2009.09.17

But one thing is sure. Developing countries need more of them as more people get heart disease.

VOA: special.2010.06.29

The idea is make the other players believe you have strong cards and are sure to win.

VOA: special.2009.11.22

If they arrive before you are ready to plant them, make sure the packing material is moist.

VOA: special.2010.06.15