1.An expert is_____who has special knowledge,skill or training.
A.that
B.one
C.which
D.such
2.Since it is late to change my mind now,I am ___ to carrying out the plan.
A.obliged
B.committed
C.engaged
D.resolved
3.The_____of establishing a new national park seemed to be very attractive.
A.plan
B.project
C.item
D.progress
4.Poor Susan got a serious seasick during the _____.
A.journey
B.tour
C.voyage
D.trip