53.A.important B.valuable C .limited D.up
52.A.skill B.method C.experience D.way
51.A.under B.among C.from D.with
50.A.anything B.something C.nothing D.everything
49.A.provided B.included C.formed D.needed
48.A.pressure B.influence C.question D.doubt
47.A.accept B.collect C.follow D.insist
46.A.and B.but C.so D.then
45.A.average B.arrange C.divide D.organize
44.A.form B.timetable C.method D.system