如图所示，MN为两个匀强磁场的分界面，两磁场的磁感应强度大小的关系为B1＝2B2，一带电荷量为＋q、质量为m的粒子从O点垂直MN进入B1磁场，则经过多长时间它将向下再一次通过O点( )
It is by no means clear ______ the president can do to end the strike．（2012．全国新课标Ⅱ）
It remains to be seen ______ the newly formed committee’s policy can be put into practice. (2013 .陕西)
It was only after he had read the papers ______ Mr. Gross realized the task before him was extremely difficult to complete. (2013 .全国新课标Ⅱ)
John’s success has nothing to do with good luck. It is years of hard work______ has made him what he is today. (2011 .湖南)
It was from only a few supplies that she had bought in the village ______ the hostess cooked such a nice dinner. (2012 .安徽)
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