In big cities, pollution is ........................................ to health and is often difficult to mitigate.

Civil engineer had better ................. steel supports in concrete structures built on unstable geophysical sites.

Fast food has dramatically affected .................. many people eat

The crime rate has begun to decline in New York City due to efforts on the parts of both government and private citizens to curb

We call physiology, ........................... of the human body.

Uranus is just .............................................. to be seen on  a clear night with the naked eye.

Of all the factors acting on agricultural output, weather is the one  ........................ the most.