Passives

1.       Gold (discover) (a)   in California in 1848.

The Amazon valley is extremely important to the ecology of the earth. Forty percent of the world’s oxygen (produce) ____ there.

• is produced

• produced

• is producing

Right now Roberto is in the hospital. He (treat) ___ for a bad burn on his arm.

• is be treated

• is being treated

• is treating

• being treat

In my country, certain prices, such as the price of medical supplies, (control) ____ by the government. Other prices (determine) ____ by how much consumers are willing to pay for a product.

• control/determine

• are controlled/are determined

• is controlled/are determined

• were controlled/were determined

Richard Anderson is a former astronaut. Several years ago, when he was 52, Anderson (inform) ____ by his superior at an aircraft corporation that he could no longer be a test pilot. He (tell) ____ that he was being relieved of his duties because of his age. Anderson took the corporation to court for age discrimination.

• be informed/be told

• was informed/is told

• was informed/was told

• was inform/was tell

Frostbite may occur when a person’s skin (expose) ____ to extreme cold. It most frequently (affect) ___ the skin of the cheeks, chin, ears, fingers, nose, and toes.

• is exposed/affects

• exposed/is affected

• expose/affect

• was exposed/affected

Since the beginning of the modern industrial age, many of the natural habitats of plants and animals (destroy) (a)   by industrial development and pollution.

Carl Gauss (recognize) (a)   as a mathematical genius when he was ten. One day a professor gave him an arithmetic problem.

Carl (ask) (a)   to add up all the numbers from 1 to 100 (1 + 2 + 3 + 4 + 5, etc.).

It (take) ____ him only eight seconds to solve the problem. How could he do it so quickly? Can you do it quickly?

(a)