13. There would be much less pollution________ people stopped using cars completely.
A. if B. since C. when D. although
14. Emissions of pollutants into the air can________ changes to the climate.
A. get on B. end up C. go into D. result in
15. ________can we help save our environment?
A. What B. How C. Why D. How much
16. Water pollution________ the death of all forms of life in the water bodies.
A. occurs B. results of C. creates D. leads to
17. ________ plastic takes so long to break down, it pollutes the land and ocean.
A. Because B. Due to C. Even if D. Although
18. Many flights were cancelled ________ the smoke from forest fires.
A. so B. because C. because of D.result in
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