However,the area called Cypress Mountain has been a problem.

VOA: special.2010.02.10

Censorship has been a problem in Thailand off and on for decades, even without emergency laws.

VOA: standard.2010.07.06

"But there is a problem. He is one of the men who have been coming to see me in answer to your advertisement.

VOA: special.2010.04.24

It was both a labor problem and an immigration problem thousands of Chinese workers had been brought to America to help build the Central Pacific Railroad.

VOA: special.2010.03.11

The loss of one oxygen tank should not have been a major problem.

VOA: special.2009.07.22

Deforestation has traditionally been a major problem for farmers.

VOA: special.2010.04.13

Stuttering's cause has long been a mystery, but it has frequently been diagnosed as a psychological problem.

VOA: standard.2010.02.11