1 Europeans — (explore) Africa in the 18th
century.
2 Tutankhamen — (live) in Egypt a long time
ago.
3 The first astronauts — (visit) space in 1981.
4 Columbus — (arrive) in South America
about 500 years ago.
5 People — (stop) using horses for transport
in the 19th century.
6 In 1700 people — (travel) by plane.
7 Graham Bell — (invent) the telephone.