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在新民主主义社会中存在多种经济成分，其中掌握了国家主要经济命脉的是 ______。
设函数 f(x) 在x=0处连续，下列命题错误的是（）
The problem ________ when the students refused to do their homework.
She got a job as an assistant stage manager at the Cambridge Arts Festival Theatre, thinkingthat it might ________ to a career as a playwright ( 剧作家 ).
We regret to ________ that it may not be possible to deal with every request.
