Onnoaccount____everleavethebabyathomealone.
A、shouldyouA
【句意】 你决不应该把小孩一个人放在家里。
【难点】 on no account 意为“决不”属否定意义的词，引导倒装句，所以只有A)项正确。
Nowhereinnatureisaluminumfoundfree,owingtoitsalways____withotherelements,mostcommonlywithoxygen.
Ithink____importanttolearnEnglishwell.
Hewasalmostasleep,____withallthishardwork.
—Icametoyourofficeyesterdaymorning,butnobodywasin.
—Oh,we__________ameetinginthemeetingroom.
—Haveyoufinishedthework?
—Notyet,butnomatterhowharditis,we'llkeep___untilwemakeit.
