Leia as sentenças abaixo:

I. The waiter that served me at the coffe shop moved away.
II. He saw that the bottles were empty.
III. Carla told me that she was going to quit the restaurant where she works in.
IV. I didn’t get the job that I applied for.

Em qual (is) das sentenças acima o uso do pronome relativo em negrito é extremamente necessário?