把下列主动语态的句子转换成被动语态的句子

The books were taken away by someone yesterday.
A sports meeting will be held by us in September.
The babies are being taken care of by the nurse.
A computer was gaven to me as my birthday present by Mum.
A tall building is going to be built here .
He is made to work all day by them.
My father's lost watch was never expected to be found.

was taken away;will be held by us;are being taken care of;