When I try to understand ____ that prevents so many Americans from being as happy as one might expect, it seems to me that there are two causes.
. The famous basketballer, _______ tried to make a comeback, attracted a lot of attention.
I saw some trees the leaves of _____ were black with disease.
Their problem today is somewhat similar to _____ they faced many years ago.
Dorothy was always speaking highly of her role in the play, ____, of course, made the others unhappy.
He made another wonderful discovery, ______ of great importance to science.