Answer:
1. Mrs. Hill wishes her daughter, C) had gone.
2. I wish I C) had stayed to university.
3. Joseph wishes he A) were.
4. My father wishes he D) hadn't bought that car.
5. Michael and Meg wish they A) were on holiday in Miami instead of having to work all day in this boring office.
6. I wish we C) were a rich man so that he could buy the red sports car in his dreams.
7. I wish you B) won't be so selfish.