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

2) The game (win, probably) by the other team tomorrow. They're a lot better than we are.

3) In my country, certain prices (control) by the government, such as the prices of medical supplies. However other prices (determine) by how much people are willing to pay for a product.

4) There was a terrible accident on a busy downtown street yesterday. Dozen of people (see) it, including my friend, who (interview) by the police.

5) Yesterday the wind (blow) my hat off my head. I had to chase it down the street. I (want, not) to lose it because it's my favorite hat and it (cost) a lot.

6) Right now Alex is in the hospital. He (treat) for a bad burn on his hand and arm.

7) Yesterday a purse-snatcher (catch) by a dog. While the thief (chase) by the police, he (jump) over a fence into someone's yard, where he encountered a ferocious dog. The dog (keep) the thief from escaping.

8) Frostbite may occur when the skin (expose) to extreme cold. It most frequently (affect) the skin of the cheeks, chin, ears, fingers, nose, and toes.

9) The first fish (appear) on the earth about 500 million years ago. Up to now, over 20,000 kinds of fish (name) and (describe) by scientists. New species (discover) every year, so the total increases continually.

10) Proper first aid can save a victim's life, especially if the victim is bleeding heavily, has stopped breathing, or (poison)