Fill in the blank with its approprite form with given words
1. At present, all countries in the world are worrying about the                problem. (environment)
2. All meal are               throughout the course. (provision)
3. Sulphur dioxide is one of several               that are released into the atmosphere by coal-fired power station. (pollution)
4. The                  of the environment must be our first priority today. (protect)
5. No efforts are made to disinfect the sewage or to remove               pollutants. (harm)
6. l am                          that people have spoiled this area. (disappointment)
7. Make sure the use of                  is not harmful to farm's worker health. (pest)
8. lf                  continues, there will be no forest left ten years from now on. (forest)
9. The voted in favor of the                 of smoking in public area. (prohibit)
10. Don't pump             into sea and river or it'll pollute them. (sew)
11.                        are interested in the protection of the environment. (conserve)
12. People must be                  in catching fish in order to avoid killing small fish. (care)