11. Fossil fuels are becoming (exhaust) while the world's demand for energy is increasing. 12. Wind energy is abundant and (limit) however is it not always available. 13. Sometimes the staff in that shop are very rude and (polite) 14. Air water and soil are necessary things to our (survive) 15. Water power provides energy without ( pollute). 16. You are old enough to take ( responsible) for what you have done. 17. Life ( expect) of people around the world has increased dramatically.

1. Lists of (danger) species have been made by the scientists. 2. This problem is too ( complicate) for us to solve. 3. The government should prohibit factories from ( discharge) chemical ( pollute) into the environment. 4. His ( perform) was highly ( appreciate) by the art council. 5. (able) athletes are provided with special facilities and special services. 6. Mary took to collecting stamps some years ago and now she has a big ( collect) 7. Sometimes our hobbies help (broad) our (know). 8. (Sun) energy and wind energy are ( new) resources. 9. Due to the messenger call service, the (receive) are notified of the time and place to receive the call. 10. The earth is expected to be a place where human beings and other living things can ( peace) coexist.