11. Human beings are changing the by building cities and villages where forest once stood.
A. atmosphere B. space C. areas D. environment
12. Scientists think it unlikely that any species will actually become extinct as a(n) of the oil spill.
A. cause B. link C. interference D. consequence
13. He refused to give in to and threats from bigger boys in his school.
A. controlling B. forcing C. bullying D. killing
14. Nowadays, people are more aware that wildlife all over the world is in
A. problem B. danger C. risk D. threat
15. The chemical from all kinds of vehicles and factories are polluting the air seriously.
A. elements B. things C. items D. pollutants
