We must water the flowers every day. （变为被动语态）

  The flowers must ___ ___ (by us) every day.

My brother often mends his watch. （变为被动语态）

  His watch ____ ____ ____ by my brother.

We'll put on an English play in our school. （变为被动语态）

  An English play ____ ____ _____ on in our school.

Did they build a bridge here a year ago? （变为被动语态）

____ a bridge ____ here by them a year ago?

He made me do that for him. （变为被动语态）

I ____ ____ ____  ____ that for him.

People use metal for making machines. （变为被动语态）

Metal ____  ____ for making machines.

You needn't do it now. （变为被动语态）

It ____  _____  _____ by you now.

The children will sing an English song. （变为被动语态）            

  An English song ____  ____  ___ by the children.

They produce silk in Suzhou. （变为被动语态）  

Silk ____  ______ in Suzhou.

We can finish the work in two days.     （变为被动语态）             

  The work _____ _____ _____ in two days.