几道关于非谓语的英语题 having done 和 doing

题目

几道关于非谓语的英语题 having done 和 doing
1、_____(realise) that there had been a serious accident ,she ran off to call the police.
2、_____(see) running across the floor by the cleaner ,the rat stopped,moving its head from side to side.
3、_____(notice) a small white cat walking into the classroom,he smiled happily.
4、_____(leave) a note on the top of the remote,Brian's wife stopped and looked around sadly before leaving their home for the last time.
5、_____(hear) the alarm,they rushedout of the classroom and gathered on the field.
不知道是用having done 还是 doing
顺便说说为什么

答案

Realizing

Seen

Noticing

Leaving

hearing