Dưới đây là các câu tương ứng với yêu cầu của bạn:

1) Mary could not go to school because she was sick.
=> Because of **her sickness, Mary could not go to school.**

2) Because there was a big storm, I stayed at home.
=> Because of **the big storm, I stayed at home.**

3) Though he had not finished the paper, he went to sleep.
=> In spite of **not finishing the paper, he went to sleep.**

4) 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.**