<span>He repeatedly hints that he is too old to properly host</span>
5--all of the other sentences are details relating to this main point.
The sentence that uses a verb that agrees with its subject is D. Here are some new stamps from the post office.
Subject - Stamps (plural) Verb - are (plural)
A) Subject - Buildings(plural) Verb used - hides (singular) should be: hide (plural)
B) Subject - Minerals (plural) Verb used - is (singular) should be: are (plural)
C) Subject - Athlete (singular) Verb used - sit (plural) should be: sits (singular)
