In the U.S. today, it is common to pay one fourth to one third of

family’s income on the place to live. Big houses are more expensive

than smaller ones. And houses closer to the center of big cities are

more expensive than the ones in the suburbs or in small towns.

39. The c _________ of housing in the U.S. today is very high.

Paragraph Five

A new public health report concludes there is no safe level of

environmental tobacco smoke. One of the nation’s top public health

physician says inhaling someone else’s tobacco smoke leads to an

immediate chain of biological events that can lead to disease in a non

-smoker and even death.

40. Expert w __________ against environmental tobacco smoke.

Paragraph Six

Dehydration limits a person’s ability to work and think. Experts say a

reduction of only four or five percent in body water leads to a drop of

twenty to thirty percent in work ability. The loss of salt through

perspiration also reduces the amount of work that muscles can do.

41. R ________ between dehydration and person’s ability to work and

think.