Сложное подлежащее

Измените предложения, используя в них конструкцию «сложное подлежащее».
1. It is known that he is the best student. 2. It was considered that the train would arrive on time. 3. They say that the firm has gone bankrupt. 4. Everybody believed that the theory was wrong. 5. We know you are fond of jazz. 6. It so happened that I overheard this conversation. 7. I am certain that the treatment will help you. 8. It seems that he takes it too close to heart. 9. It is likely that the article will be published in the next issue. 10. They announced that the result was excellent.