THE AIR HAS BECOME MORE AND MORE POLLUTED BECAUSE OF EXHAUST FUMES...

30. - 25 DE THI HOC KI 1 MON TIENG ANH LOP 12 CO DAP AN
25 DE THI HOC KI 1 MON TIENG ANH LOP 12 CO DAP AN

30. The air has become more and more polluted because of exhaust fumes from vehicles.

A. preserved

B. wasted

C. contaminated

D. conserved

Choose the underlined word or phrase in each sentence that needs correction.