The research suggests that to grow, they have to be able to export the hormone into the main stem.

VOA: special.2009.10.13

Public schools in the United States have to be neutral about religion, even though they close for holidays like Christmas.

VOA: special.2009.12.24

Companies also have to be careful or they could get into trouble with the Equal Employment Opportunity Commission.

VOA: special.2011.02.28

Beets much larger than that can be tough and have to be cooked for a long time.

VOA: special.2010.03.02

But he says any new product will have to be different enough that people will not be able to find it anywhere else.

VOA: special.2009.03.21

Because of the gravity on Mars, spacesuits may have to be designed to be lighter than suits used in orbit or on the moon.

VOA: special.2011.04.06

Tanya Pinto says you do not have to be wealthy or well known to help others.

VOA: special.2009.08.10

French President Nicolas Sarkozy said, "If by December, there is not an in-depth change by the Iranian leaders, sanctions will have to be taken."

VOA: special.2009.09.26

People in business have to be careful if they are to survive the jungle out there.

VOA: special.2010.05.16

Some common fruit trees such as sweet cherries and McIntosh apples have to be grafted.

VOA: special.2010.05.18

But you don't have to be very smart to know what his trouble is.

VOA: special.2009.11.29

You don't have to be from the theater world to do a show.

VOA: special.2009.08.05

Cleveland agreed. But he said the operation would have to be kept secret.

VOA: special.2010.06.17

And that's something that you have to be willing to put up with."

VOA: special.2009.05.18