3. A. What color the first movies were B. Who is trying to color the old movies C. Why old movies should not be changed D. Which stars were in the first color movie

6. A. What makes fireflies glow at night B. Who waters the plants C. how scientists make plants glow D. How scientists drink the plant juice

9. A. About the job of spy pilots B. How spy pilots destroy other planes C. How different kinds of cameras work D. What kinds of pictures cameras take

12. A. How dirty water might be harmful B. Where to find frogs C. Why ponds are bad D. Who makes dirty water

13. A. How dirty water might be harmful

15. A. About the man who founded the city of Chicago B. About fur trading C. How Chicago got its name D. Where Jean Du Sable was born

16. A. About the man who founded the city of Chicago