7. More than a hundred species of animal has_____in the last 200 years ( appear)
8. Nuclear energy can provide enough____For the world's need for hundreds of years (electric)
9. We use solar energy for our _____life ( day)
10. Solar energy is not only ____but also clean and safe ( plenty)
11. Grass for animals is a ____resource( new)
12. The total energy____in 2005 was over 150 million tons ( consume)