American university students are usually under pressure because____．

Chinese and Russian scientists have reposed that in places ______stress is building up, the radon levels of the water build up too.

Copying files under Linux is similar ______ copying files under DOS.

Under stress, people's blood pressure goes up, _________their race or sex.

People with type A blood cart receive______.

Eating too much fat can__________ heart disease and cause high blood pressure．

The ______ of blood always makes him sick.

If you have high blood pressure, you should _____ eating too much salt.

People differ______one another______their ability to handle stress.

In order to prevent stress from being set up in the metal, expansion joints are fitted which _____ the stress by allowing the pipe to expand or contract freely.

If Simon is feeling stressed， he should __________ . 

Compared with literature, communication stresses ______.