1. 1. Where was the abacus
invent?
A)In Russia B)in USA C)in China.
2. When was the clock invent?
A) In the eleventh century.
B) in the ten century.
C) in the nineteenth century.
3. When was the compass
invent?
A) B IX century.
B) XVI century.
C) XI century.
4. Where were guns invent?
A) Mexico
B) Europe
C) in France.