Ex5: Choose the option that best completes the following sentence 
1. Governments should prevent people....................cutting down trees in the forests 
 A.  with      B. from       C. on        D. into 
2. Everybody should work together to keep the environment .....................
 A. polluted       B. unpolluted      C. pollution     D. polluting 
3. We shpuld send these used cans and bottles to .........................centers 
 A. recycling        B. recycled            C. recycle        D. recycles 
4. Jane : What about putting more trash cans on the streets ? 
    Mary : ...................................
 A. I dislike trash cans       B. Oh , that's for recycling       C. Let's recycle !        D. That's a good idea 
5. Green forests provide more spaces .........................animals and birds 
  A. with        B. for          C. into           D. onto 
6. People shouldn't use plastic bags .....................they can reduce land pollution . 
 A. but        B. that        C. so that        D. although 
7. We should always remember 3 Rs to protect the environment , '' Reduce , Reuse .................Recycle'' .
 A. or          B. but           C. if            D. and 
8. Jack :....................................................?           Jimmy : We shouldn't throw trash into the water 
 A. What do you do with the water                          B. What should we do to prevent water pollution 
 C. Why do people pollute the water                      D. Are we polluting the water 
9. People are trying their best to keep the environment .............................
 A. pollutant           B. polluted             C. unpolluted              D. pollution 
10. Recycling trash can .......................land pollution 
  A. reduce     B. cause    C. reuse    D. pollute 
 11. Everybody should travel by bicycle or public buses ................we can reduce air pollution 
  A. but           B. in order to            C. so as to              D. so that 
  12. Our teachers suggested ........................more trees along the streets to get more fresh air 
  A. planting                B. buying            C. cutting            D. moving