Bonjour !
a.
1. Today Britain is less industrial than in Victorian times.
2. Today Britain is not as industrial as in Victorian times.
b.
1. Today the Thames is less polluted than in Victorian times.
2. Today the Thames is not as polluted as in Victorian times.
c.
1. In Victorian times, living conditions were less acceptable than today.
d.
1. Today Britain is less influential than in Victorian times.
2. Today Britain is not as influential as in Victorian times.
J'espère t'avoir aidé. Bon courage !