1.it being a wet day,we could not go for a walk.
2.not knowing how to do it ,he went to her for help.
3.Having made the beds ,she started making breakfast.
4.hearing the news,they jumped with joy.
5.not knowing where she lived ,he had to return home to ask his father.
6.The man standing there is tom ,a new English teacher.
7.The power station being built now is one of the largest in China.