GRAMMAR REVIEW

1. The Amazon valley is extremely important to the ecology of earth. Forty percent of the worlds oxygen (produce).. there.2. The game (win, probably).. by the other team tomorrow. Theyre a lot better than we are.3. There was a terrible accident on a busy downtown street yesterday. Dozens of people (see) it, including my friend, who (interview). By the police.4. 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.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 its my favorite hat and it (cost). a lot.6. Right now Alex is in 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 the fence into someones 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, 20,000 kinds of fish (name).. and (describe). by the scientists.10. A network of lines (discover).. on Mars surface by an Italian astronomer around the turn of the century. The astronomer (call) these lines channels, but when the Italian word (translate). into English, it became canals. As a result, some people thought the lines were waterways that (build).. by some unknown creatures. We now know that the lines are not canals. Canals (exist, not). on Mars.