Mark the letter A, B, C, or D on your answer sheet to indicate the correct option that best fits each of the numbered blanks from 18 to 23.

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from that of the other three in pronunciation in each of the following questions.

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from that of the other three in pronunciation in each of the following questions.

a. You can turn off the lights when you leave a room, and you can unplug electronics when you're not using them.

b. Another way is to use public transportation instead of driving a car, walk or ride a bicycle for short distances.

c. There are many ways to save non-renewable energy.

d. Finally, you can recycle paper, plastic, glass, and metal to help reduce waste.

e. One way is to use less electricity.

Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of stress in each of the following questions.