| 1. Traffic signs are _______________ by shape, colour and the messages printed on them. | | |
| 2. His problems only _______________ when he began to drink. | | |
| 3. I just bought some computer _______________ which allows me to figure out my income tax in about half an hour. | | |
| 4. She missed her 1:00 dance class, but the teacher said there was another _______________ at 3:00 she could go to. | | |
| 5. Antarctica was the last continent to be _______________ by mankind. | | |
| 6. Black holes in outer space apparently _______________ energy and light, and crush them into nothingness. | | |
| 7. A _______________ of light broke through the clouds. | | |
| 8. My son blew up his high school by accident while doing a chemistry _______________ in science class. | | |
| 9. A drop of water may travel thousands of kilometres between the time it evaporates into the _______________, and the time it falls to the Earth again as rain, sleet, or snow. | | |
| 10. We memorized vast _______________ of useless facts when I was in school, but we didn't necessarily learn how to really think for ourselves. | | |
| 11. The severity of an earthquake is _______________ using a device known as the Richter scale. | | |
| 12. Lightning _______________ charges can spread for over 150 kilometres. | | |
| 13. Blue whales are the largest animals to have ever lived on our _______________. | | |