4. What is Gregorio Zara known for inventing?
A) The first Filipino-made car
B) The wireless telephone
C) A revolutionary irrigation system
D) A new type of solar panel
5. Who developed a machine that can help produce fuel out of ethanol and water?
A) Maria Ylagan Orosa
B) Julian Banzon
C) Juan Flavier
D) Diosdado Banatao