Here are the rewritten sentences:

1. Although Tom was a poor student, he studied very well.
   - **In spite of** being a poor student, Tom studied very well.

2. Mary could not go to school because she was sick.
   - **Because of** her sickness, Mary could not go to school.

3. Although the weather was bad, she went to school on time.
   - **Despite** the bad weather, she went to school on time.

4. My mother told me to go to school although I was sick.
   - **In spite of** being sick, my mother told me to go to school.

5. Because there was a big storm, I stayed at home.
   - **Because of** the big storm, I stayed at home.

6. Tom was admitted to the university although his grades were bad.
   - **Despite** his bad grades, Tom was admitted to the university.

7. Although she has a physical handicap, she has become a successful woman.
   - **Despite** her physical handicap, she has become a successful woman.

8. In spite of his good salary, Tom gave up his job.
   - **Although** he had a good salary, Tom gave up his job.

9. Though he had not finished the paper, he went to sleep.
   - **In spite of** not finishing the paper, he went to sleep.

10. In spite of the high prices, my daughter insists on going to the movies.
    - **Even though** the prices are high, my daughter insists on going to the movies.

 * Although Tom was a poor student, he studied very well.
 * In spite of being a poor student, Tom studied very well.
 * Despite being a poor student, Tom studied very well.
 * Mary could not go to school because she was sick.
 * Because of her sickness, Mary could not go to school.
 * Although the weather was bad, she went to school on time.
 * Despite the bad weather, she went to school on time.
 * My mother told me to go to school although I was sick.
 * In spite of being sick, my mother told me to go to school.
 * Because there was a big storm, I stayed at home.
 * Because of the big storm, I stayed at home.
 * Tom was admitted to the university although his grades were bad.
 * Despite his bad grades, Tom was admitted to the university.
 * Although she has a physical handicap, she has become a successful woman.
 * Despite her physical handicap, she has become a successful woman.
 * In spite of his good salary, Tom gave up his job.
 * Although Tom had a good salary, he gave up his job.
 * Though he had not finished the paper, he went to sleep.
 * In spite of not finishing the paper, he went to sleep.
 * In spite of the high prices, my daughter insists on going to the movies.
 * Even though the prices are high, my daughter insists on going to the movies.