19. ________the garbage dump smells terrible, no one lives around there. A. Because of B.Since C.As a result of D. Even th

19. ________the garbage dump smells terrible, no one lives around there.
A. Because of B.Since C.As a result of D. Even though
20. Grace didn’t love nature, ________ she wasn’t happy when her group went camping in a jungle.
A. but B. and C. because D. so
21. Thousands of fish were killed ________ a discharge of poisonous chemicals from a nearby factory.
A. because B. lead to C. result in D. as a result of
22. A flood_________ when a large amount of water covers the land.
A. occurs B. is occurred C. is occurring D. has occurred
23. Could you list some non-point source __________?
A. pollution B. pollutants C. polluting D. polluted
24. Families camped out in a City park after their homes_________ by the earthquake.
A. have heavily damaged B. had damaged heavily
C. were heavily damaged D. are damaged heavily