I. Hãy rút gọn các mệnh đề trạng ngữ trong các câu sau. 1. Because I knew that he was poor, I offered to pay his fare. .................................................................................................................................................................. 2. After we barricaded the windows, we assembled in the hall. .................................................................................................................................................................. 3. As she became tired of my complaints about the program, she turned it off. .................................................................................................................................................................. 4. He found no one at home before he left the house in a bad temper. .................................................................................................................................................................. 5. Since he hoped to find the will, he searched everywhere. .................................................................................................................................................................. 6. After the criminal removed all traces of his crime, he left the building. .................................................................................................................................................................. 7. After he realized that he had missed the last train, he began to work. .................................................................................................................................................................. 8. Because he was exhausted by his work, he threw himself on his bed. .................................................................................................................................................................. 9. After he had spent all his money, he decided to go home and ask his father for a job. .................................................................................................................................................................. 10. He looked for a place where he could get food after he escaped from prison. ..................................................................................................................................................................