A.controversial
B.trivial
C.essential
D.optional

A.come in
B.live in
C.like
D.prefer

A.retaining
B.stopping
C.pausing
D.ending

A.scarce
B.available
C.decreasing
D.plentiful

A.remaining stable
B.going up
C.decreasing
D.developing

A.improvising
B.enhancing
C.implementing
D.enacting

A.implementation
B.enlightenment
C.encouragement
D.endorsement

A.harsh
B.separate
C.safe
D.serious

A.frighten
B.worry
C.dare
D.fear

A.frighten
B.worry
C.dare
D.fear