Theopeningceremonyisagreatoccasion.Itisessential_____forthat.
A、forustobeprepared
B、thatweareprepared
C、ofustobeprepared
D、ourbeingprepared
Thecountry’schiefexportsarecoal,carsandcottongoods,cars_____themostimportantofthese.
A、havebeen
B、are
C、being
D、arebeing
HismannerwassopleasantthatBollafeltat（）withhimatonce.
A、peace
B、large
C、ease
D、best
Evenasagirl,_____tobeherlife,andtheateraudiencesweretobeherteachers.
A、performingbyMelissawere
B、itwasknownthatMelissa'sperformanceswere
C、knowingthatMelissa'sperformanceswere
D、Melissaknewthatperformingwas
Nowhereinnatureisaluminumfoundfree,owingtoitsalways____withotherelements,mostcommonlywithoxygen.
A、beingcombined
B、havingcombined
C、tocombine
D、combined