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1.I have _____the speech contest this Saturday.

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1.I have _____the speech contest this Saturday.
A.signed for B.signed up for C.signed up
答案给的是b 为什么不能选c
2.Think of all the things you can do _____(helpful) the poor.
fall into、fall behind、 fall down、 fall off 之间有何区别?
1、sign up 签约雇用,签约参加
2、to helpful
3、fall into落入;分成
fall behind拖欠;落在后面
fall down跌倒;失败;倒塌
fall off n.下降,减少;分开;减退