Fill in the Blanks with either who, whom, or whose

1. ________ are you going to recommend?
   
2. ________ car is parked in the handicapped parking space? If someone doesn't move it, its going to be towed
   
3. ________ are you going to recommend
   
4. The police have called in an expert to identify ________ handwriting is actually on the ransom letter
   
5. I know exactly ________ I'm going to support in the upcoming election.