Réponse :
a.In the 19th century they invented the steam engine (je pense)
b.Oliver Twist and Hard times were written by Charles Dickens
c.A vacum cleaner was used today by everybody
d.The first locomotive was designed by Stephenson in 1814
e.The effects of colonization will be seen here (je pense)
f.The first factory was founded by Richard Arkwright
Explications :