IX. Choose the best option to fill in each gap in the text. Sometimes it is necessary to (44)……….. our habits. Saving energy is one illustration. If we can (45) ………. more energy, such as water and electricity, we can help keep the natural environment safe. Saving water, for example, helps preserve our rivers and reservoirs. If we usually take 10- minute showers, in this case we should try to take shorter showers. When we go out, we (46) ………. remember to shut off electronic like televisions and computers. Turning (47)……… the lights is another example of saving electricity. In short, remembering to help the environment, such as by saving energy, is one of our mostnecessaryresponsibilities. Question 44. A. exchange B. turn C. change D. make Question 45. A. help B. cut C. saving D. save Question 46. A. must B. may C. had D. should Question 47. A. on B. in C. without D. off