9. The traffic was bad. I arrived at the airport on time. (though)

=> Though the traffic was bad , I arrived at the airport on time.

10. I didn’t get the job. I had all necessary qualifications. (though)

=> Though I didn't get the job, I had all necessary qualifications.

11. We enjoyed the vacation. It rained a lot. (although)

=> Although it rained a lot, we enjoyed the vacation.

12. She felt sick. She went to work. (though) 

=> Though she felt sick, she went to work.

13. I was really tired. I couldn’t sleep. (even though)

=> Even though I was really tired, I couldn't sleep.

14. He is very rich. He isn’t happy. (although)

=> Although he is very rich, he isn't happy.

15. She couldn’t answer the question. She is very intelligent. (though)

=> Though she is very intelligent, she couldn't answer the question.

16. He tried. He was not successful. (though)

=> Though he tried, he was not successful.

17. His life is hard. He determined to study well. (although)

=> Although his life is hard, he determined to study well.

18. He was wise and experienced. He was not taken in. (though)

=> Though he was wise and experienced, he was not taken in.