В каждом предложении два варианта возможны, выбрать можно любой:
Where's the nearest shop that/which sells bread?
The driver who/that caused the accident was fined £500.
Do you know the person that/who took these pictures?
We live in a world that/which is changing all the time.
Dan said some things about me that/which were not true.
What was the name of the horse that/which won the race.