Răspuns:
1. ENLARGE
2.SHORTEN
3.WEAKEN
4.ENSURE
5.BROADEN
6. STRAIGHTEN
to enlarge en + large, prefix = a mări
to shorten short + en, sufix = a scurta
to weaken weak + en, sufix = a slăbi
ensure en + sure prefix = a se asigura
to broaden broad + en = a lărgi
to straighten straight + en = a îndrepta