| 1. Don't _______________ my freshly-washed floors with your boots. | | |
| 2. The fireworks exploded, sending a shower of _______________ down on the heads of the spectators. | | |
| 3. She chose most of the different plants in her garden for the lovely _______________ they give off. | | |
| 4. The police _______________ the prisoners into the courtyard to be searched. | | |
| 5. Lead is a dangerous _______________ which has been eliminated from the gas used in cars. | | |
| 6. According to one study, plant and animal species are becoming _______________ at the rate of 17 per hour. | | |
| 7. Most of southwestern Paraguay is _______________ and wet, but there are swells of higher land that remain dry, and permit settlement. | | |
| 8. The island of Australia _______________ many plant and animal species which are not found in any other part of the world. | | |
| 9. She had a fever and then she had the _______________ before she finally threw up. | | |
| 10. He works in _______________ developing trees that are more naturally resistant to pests. | | |
| 11. The cat lay on the carpet in front of the fireplace, curled up into a _______________ little ball. | | |
| 12. Leopards mark their territory by spraying their scent on _______________ or trees. | | |
| 13. Niagara Falls takes its name from a Mohawk Indian word meaning '_______________ of waters.' | | |
| 14. Dirty snow _______________ faster than clean snow. | | |