III. Choose the best answer (2 points): 5. Environmental pollution has _____ to lots of health problems. A. made B. caused C. led D. resulted 6. If the factory continues dumping poison into the lake, all the fish and other aquatic animals ________________. A. die B. to die C. dead D. will die 7. These children _____ any food for two days before help arrived. A. haven’t had B. will have C. hadn’t have D. hadn’t had 8. If I were you, I ___________ the walls. A. would repaint B. will repaint C. repaint D. repainting 9. I’m learning English to join an ______________ summer camp. A. nation B. internation C. international D. local 10. Hoa has made lots of ____________ in learning English. A. improve B. improvements C. improving D. improved 11. Water ________________ in the lake has made the fish die. A. pollution B. pollute C. polluted D. polluting 12. If we __________ more, we will save a lot of trees. A. uses B. using C. used D. use

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