1.  

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

2.  

______ shoes are these?

3.  

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

4.  

John, ____ I’ve always considered to be my best student, did very poorly on his test yesterday.

5.  

In the summer I will go to Santorini, _____ is a beautiful Greek island.