根据句意和汉语提示写出单词，完成句子。
Lucy is busy today. Shall we ask Lily_______ (代替)?
Everyone _______ (出席) that meeting yesterday afternoon.
No one is willing to help Tom, so he feels _______ (无助的).
English is one of the most important ___________ (语言) in China.
Who did better in the Maths ________ (竞赛), Li Ming or Sun Wei?