Rewrite the sentences

1.They are building a factory to recycle waste paper in this city

-] A factory........

2.Mr Nam is fixing the faucets in the bathroom

-] The faucets...

3. The workers were repaining the bridge when it collapssed 

-] The bridge.....

4. We were painting the walls at this time yesterday

-] The walls...

5.They are cleorating the tree for the chrictmas

-] The tree