(17)
A.develop
B.developing
C.developed
D.developmental

(19)
A.whom
B.that
C.what
D.when

(19)
A.what
B.how
C.why
D.that

(21)
A.in
B.away
C.off
D.over

(23)
A.ones
B.they
C.both
D.two

(25)
A.required
B.gained
C.acquired
D.obtained

(27)
A.poses
B.offers
C.leads
D.imposes

(29)
A.survive
B.survival
C.survivor
D.survived

(2)
A.urgent
B.practical
C.various
D.future

(3)
A.noticed
B.notified
C.remembered
D.reminded