Choose the correct answer

The police have sold the car in auction, ____ no one came to take it. (but/ so/ for) Whale Festival is the biggest festival of the fishermen, ____ it is common. (and/ but/ or) The discussion was not exciting, ____ was it informative. (or/ so/ nor) It may rain tomorrow, ____ we are going home in any case. (but/ nor/ and) The staff in our company can dine out, ____ they can order in. (so/ or/ for) Dorothy works ten hours a day, ____ he has time to volunteer at a charity. (yet/ and/ nor) The injured man was incapable of walking, ____ he had to be carried. (but/ and/ so) She looks shy and skinny, ____ she is a karate athlete. (or/ yet/ and) I made a suggestion, ____ they chose to ignore it. (so/ but/ nor) I bought these three shirts, ____ they gave me the another one for free. (for/ and/ or)