Please solve the question number A (1 to 6)..
Please do it fast...

1. - c. if it hadn't been so expensive.
2. - d. if he had seen him before the surgery.
3. - a. if you had not attended the meeting.
4. - b. if they had stayed longer and seen the places around.
5. - f. if I hadn't received such a warm invitation from you.
6. - e. if he had eaten a snack before the show.
Hope it solves your query.