Question 18: Too much use of electric lights in cities may cause ______pollution. A. water B. light C. noise D. visual Question 19: Water quality has become a ______ problem. A. nation B. nationally C. national D. nationality Question 20: Let’s ________ some pictures of the factory to illustrate our presentation. A. do B. have C. make D. take Circle the letter A, B, C, or D on your answer sheet to indicate the most suitable respose to complete each of the following exchanges. Question 21: Mi: “How about giving a presentation about water and air pollution?” Nick: “________” A. I don’t know. B. That’s a good idea. C. Thanks. D. No, I don’t. Question 22: A: “I think if people travel to work by bus, there will be fewer car fumes.” B:“_______.” A. It’s a good idea. B. Yes, I do. C. That’s right. D. No problem. Circle the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions. Question 23: If she finishesthe work, she can gotohome. Question 24: If it not rain, Peter would pay us a visit.