Where was gunpowder originally invented? a. Germany b. England c. China d. India
China
This invention was launched on June 29, 2007. What is it?
iphone
Optical lenses were invented in ancient ______________ (Greece / Egypt)
Egypt
Compass was invented in ancient ______________ (China / Egypt)
China
The first _______________ for using in a room was invented in 1958.
air conditioner
