UNIT 7 – WORLD POPULATION CHOOSE THE WORD THAT HAS THE UNDERLINED PART...
12. __________ is a kind of fossil fuels, which is used for operating engines.
a. Iron
b. Silver
c. Gold
d. Petroleum
12. __________ is a kind of fossil fuels, which is used for operating engines.
a. Iron
b. Silver
c. Gold
d. Petroleum