Why not ____ help when you were in trouble

are you still here Everybody hasgone to attend the lecture by the president.— Oh, I about it!

When and where to go for the on-salary holiday ____yet.[ ]

His father told me that he ____for the United States three days _______

下面语段中画线的词语，使用不恰当的一项是(　　)林丹获得华侨大学硕士文凭之所以受到些许质疑，应与他现役运动员训练比赛太过繁忙、无法按时到学校上课有关。林丹的论文《羽毛球世界战略论》听上去绝对不同凡响，若他写作论文的过程也如邓亚萍般艰辛与精彩，不仅人们对他的怀疑将涣然冰释，而且他还将成为另一个既是世界顶级运动员，又获得高等教育硕果的楷模。