1. The minorities live in peaceful___________ within one nation. (exist) 2. The number of rare animals is decreasing so______ that they are in danger of becoming extinct. (rapid) 3. The center offers a___________ of leisure activities. (vary) 4. This energy can be changed into_____________. (electric) 5. Fuel supplies are nearly_____________. (exhaust) 6. Fax _____________ has now become a cheap and convenient way to transmit texts. (transmit ) 7. He had spent his_____________ life in China to work as an energy researcher. (entirely) 8. Gas and oil_____________ always increases in cold weather. (consume) 9. Solar energy is not only_____________ and infinite but also clean and safe. (plenty) 10. How to make full use of energy is a question for_____________ all over the world. (research)