Bonjour,

Réponse :

a. Captain America's enemy was not (= wasn't ) the same in the 1940s

and in the 1950s.

b. Joe Simon and Jack Kirby didn't create Captain America in the 1930s.

c. At the origin, Captain America didn't fight  against imaginary villains.

d. The Planeteers didn't get their powers from CaptainPlanet.

e. The five rings didn't embody five different planets.

Explications :

Prétérit forme négative :

didn't + base verbale  //  did not + base verbale

pour BE  : wasn't ( was not ) // weren't ( were not )