Read the passage carefully and choose the best answer

Read the passage carefully and choose the best answer.
People need ……(36)……... . If they don’t breathe, they will die. If they breathe (37)…..
air, they will have breathing problems and become ill. Plants (38)…… animals need clean air,
too. A lot (39)….. the things in our lives create harmful gases and make the air dirty. Dirty air is
called “ (40)….. air”.
36. A.to breathe B.breathe C. breathes D. to breathing
37. A.clean B.fresh C.dirty D. tidy
38. A.but B.and C.so D. because
39. A.in B.of C.on D. at
40. A.pollute B.polluting C.polluted D. pollution
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