Bonjour !
N°2
a- No, scientists haven't found a pill for happiness yet.
b- Americans have had the nuclear bomb about 60 years ago, in 1945.
c- No, NASA hasn't already sent people to Mars.
d- Authors have written about Martians in the publication of "The War of the Worlds" in 1898 more than a century ago.
Bonne journée
