1.  

Alex, ____ only came to Germany last year, speaks German like a native.

2.  

The front-right tire, ____ had been flat for the last 3 km, had to be changed.

3.  

The robber, ____ was arrested 5 minutes later, used an unloaded pistol to threaten the store owner.

4.  

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

5.  

This book, ____ I bought yesterday, is about Ancient Greek History