Sometimes what appear to be problems (is, are) easily solved.
A. is
B. are
Joan is one of those people who (go, goes) out of their way tobe helpful.
A. go
B. goes
He is the only one of those boys who (is, are) willing to help others.
A. are
B. is
Attending on-campus concerts (is, are) part of the pleasure of college life.
A. is
B. are