题目

 _______ the age of fifteen, she had written scores of articles for a newspaper.        A. At            B. Before          C. Since          D. By 答案：Arun across,land on,look at,play with,think about3. She       the street to help a blind man yesterday.4. The airplane       the airport safety.5. 一Why are you        your watch?―Because I don't want to be late.