PART II: EXERCISES
A. MULTIPLE CHOICE
Circle the letter A, B, C or D to indicate the correct answer to each of the following sentences.
7. ________ on a high-speed train is more comfotable than a traditional train.
A. Talking
B. Flying
C. Driving
D. Riding
8. It is not possible to run ______ hydro energy.
A. into
B. up
C. out of
D. over
9. It takes him two hours ________ that low energy bulb.
A. to fix
B. fix
C. fixing
D. for fixing
10. The wind, the sun, and the wave are some types of __________ sources of energy.
A. chageable
B. cheap
C. renewable
D. non-renewable
11. What ___________ if carbon dioxide levels continue to increase?
A. happen
B. will happen
C. happend
D. is happening