Rewrite as indicated below.
1. Tom was seriously advised by his teacher. However, he insisted in disturbing the class.
2. He felt tired. However, he stayed up to keep us company.
3. Although they didn't have much time, they came to visit us.
4. He is too old. However, he still does his gymnastics every morning.
5. The shirts are very expensive. However, people buy them because they are trendy.
6. He had no qualifications for it. However, he got the job.
7. In spite of not liking the CD you have recommended me, I bought it all the same.
I didn't like the CD you have recommended me. Nevertheless, I bought it all the same.
8. He has all the necessary books. Nevertheless, he doesn't use them to study.
Although he has all the necessary books, he doesn't use them to study.
9. In spite of working very hard, she doesn't deserve a raise.
She works very hard. However, she doesn't deserve a raise.
10. Despite not preparing for the test, she has to do it.
Although She is not prepared for the test, she has to do it.
She is not prepared for the test. However, she has to do it.
11. Although she was ill, she had to go to school.
Despite being ill, she had to go to school.
She was ill. Nevertheless, she had to go to school.