_____(not know) her address,we couldn't get in touch with her.
It's dangerous for such a little child _____(cross) so wide a road alone.
The mother made the girl ____(do) some housework erery day.
參考答案:1.Doing not know 分词作壮语，由于主语是第一人称，所以用现在分词
2.to cross It's (形容词或名词)for...to do .
3.do make后跟不带to的动词不定式作宾补表让..做某事(被动语态时要加to)