2.a. Although Tom was seriously advised by his teacher, he insisted in distubring the class.
b. In spite of the seriousness of the teacher's advice, Tom isisted in distubring the class.
3.a. Although Mary tried several times, she coudn't find a taxi.
b. In spite of trying several times, Mary coudn't find a taxi.
4. Despite feeling tired, he stayed up to keep us company.
5. In spite of don't having much time, they came to visit us.
6.a. Although he is too old, he does his gymnastics every morning.
b. Despite being old, he still does his ymnastics every morning.
7. In spite of being very expensive, people buy them because they are trendy.
8. In spite of having no qualifications for it, he got the job.
9.a. Although I didn't like the CD you have recommeded me, I bought it all the same.
b. In spite of didn't liking the CD you have recommeded me, I bought it all the same.
10.a. Although I told her all the truth, she didn't believe me.
b. In spite of telling all the truth, she didn't believe me.