Usually,this requires near-freezing temperatures, light winds and changing conditions in Earth's atmosphere.

VOA: special.2011.01.11

This requires recognizing losses in a forward looking way,".

VOA: standard.2009.04.24

Not every campaign gift requires a judge's recusal, the court said, "but this is an exceptional case."

VOA: special.2009.06.12

This law only requires testing of progress in math and reading.

VOA: special.2010.06.17

"All this,in turn, requires something else, which is something more fundamental.

VOA: special.2010.04.17

"That requires a lot of strategic patience and this is not going to happen overnight.

VOA: standard.2009.10.27

"This is an event which is serious," "This is something, which requires close monitoring.

VOA: standard.2009.05.14

"This is something that requires further consultations among all six of us."

VOA: standard.2009.12.11