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听下面一段材料,回答第1-4题。 1. On which floor do Mary and John live? A. On the 8th floor. B. On the 18th floor. C. On the 80th floor. 2. What did the neighbors do when they knew that the children were in the flat? A. They reported it to the firemen quickly. B. They reported it to the police in no time. C. They managed to open the safety gate. 3. Who finally managed to save the children? A. The firemen. B. The police. C. The neighbors. 4. What did the children's mother do at midnight? A. She was ill and went to see the doctor. B. She went to look after her sick parents. C. She went to visit a sick friend.