1.  

The girl, _____ mother was just here, has forgotten her schoolbag in the classroom.

2.  

John is reading the book ____ you brought yesterday.

3.  

She was trying a coat, ____ was two sizes smaller than hers.

4.  

The gentleman, ____ you called yesterday for an appointment, is now standing outside the door waiting for you.

5.  

Nick, ____ I would very much like to invite to dinner, is a race-car driver.