| 1. In size, _______________, and human labour, the Great Wall of China is the largest construction project ever undertaken by man. | | |
| 2. Our Christmas cactus produces beautiful pink _______________ in late December. | | |
| 3. The wooden floor of the old boat is _______________, and it wouldn't be safe to go out on the water in it. | | |
| 4. A thin _______________ of blood was trickling down his forehead from where he had been hit. | | |
| 5. My neighbour used some kind of _______________ killer on his grass, and I'm afraid it'll make my dog sick. | | |
| 6. We slept in a _______________ in the forest because it was raining so hard that our little tent wasn't enough to keep us dry. | | |
| 7. Windmills change _______________ power to energy which can be used for electricity. | | |
| 8. The sinking of the Titanic is perhaps the most famous _______________ disaster in the world. | | |
| 9. The smell of cigarettes on my clothes really _______________ after I spend an evening with my smoker friends. | | |
| 10. The _______________ is about 15,000 million years old. | | |
| 11. Kangaroo rats carry their own water source within them, producing _______________ from the food they eat, and the air they breathe. | | |
| 12. Many types of fish carry their eggs in their mouths until the babies _______________, and can care for themselves. | | |
| 13. In 1991, scientists suggested that a worldwide band of volcanic dust from the eruption of Mount Pinatubo in the Philippines could be cooling the _______________ of the entire world. | | |
| 14. Canada was originally _______________ by the native people. | | |